1
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Moretto R, Germani MM, Borelli B, Conca V, Rossini D, Boraschi P, Donati F, Urbani L, Lonardi S, Bergamo F, Cerma K, Ramondo G, D'Amico FE, Salvatore L, Valente G, Barbaro B, Giuliante F, Di Maio M, Masi G, Cremolini C. Predicting early recurrence after resection of initially unresectable colorectal liver metastases: the role of baseline and pre-surgery clinical, radiological and molecular factors in a real-life multicentre experience. ESMO Open 2024; 9:102991. [PMID: 38631269 PMCID: PMC11027482 DOI: 10.1016/j.esmoop.2024.102991] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2024] [Revised: 03/09/2024] [Accepted: 03/11/2024] [Indexed: 04/19/2024] Open
Abstract
BACKGROUND Advances in surgical techniques and systemic treatments have increased the likelihood of achieving radical surgery and long-term survival in metastatic colorectal cancer (mCRC) patients with initially unresectable colorectal liver metastases (CRLMs). Nonetheless, roughly half of the patients resected after an upfront systemic therapy experience disease relapse within 6 months from surgery, thus leading to the question whether surgery is actually beneficial for these patients. MATERIALS AND METHODS A real-world dataset of mCRC patients with initially unresectable liver-limited disease treated with conversion chemotherapy followed by radical resection of CRLMs at three high-volume Italian institutions was retrospectively assessed with the aim of investigating the association of baseline and pre-surgical clinical, radiological and molecular factors with the risk of relapse within 6 or 12 months from surgery. RESULTS Overall, 268 patients were included in the analysis and 207 (77%) experienced recurrence. Ninety-six (46%) of them had disease relapse within 6 months after CRLM resection and in spite of several variables associated with early recurrence at univariate analyses, only primary tumour resection at diagnosis [odds ratio (OR) 0.53, 95% confidence interval (CI) 0.32-0.89, P = 0.02] remained significant in the multivariable model. Among patients with resected primary tumours, pN+ stage was associated with higher risk of disease relapse within 6 months (OR 3.02, 95% CI 1.23-7.41, P = 0.02). One hundred and forty-nine patients (72%) had disease relapse within 12 months after CRLMs resection but none of the analysed variables was independently associated with outcome. CONCLUSIONS Clinical, radiological and molecular factors assessed before and after conversion chemotherapy do not reliably predict early recurrence after secondary resection of initially unresectable CRLMs. While novel markers are needed to optimize the cost/efficacy balance of surgical procedures, CRLM resection should be offered as soon as metastases become resectable during first-line chemotherapy to all patients eligible for surgery.
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Affiliation(s)
- R Moretto
- Unit of Medical Oncology 2, Azienda Ospedaliero-Universitaria Pisana, Pisa
| | - M M Germani
- Unit of Medical Oncology 2, Azienda Ospedaliero-Universitaria Pisana, Pisa; Department of Translational Research and New Technologies in Medicine, University of Pisa, Pisa
| | - B Borelli
- Unit of Medical Oncology 2, Azienda Ospedaliero-Universitaria Pisana, Pisa; Department of Translational Research and New Technologies in Medicine, University of Pisa, Pisa
| | - V Conca
- Unit of Medical Oncology 2, Azienda Ospedaliero-Universitaria Pisana, Pisa; Department of Translational Research and New Technologies in Medicine, University of Pisa, Pisa
| | - D Rossini
- Unit of Medical Oncology 2, Azienda Ospedaliero-Universitaria Pisana, Pisa; Department of Health Sciences, Section of Clinical Pharmacology and Oncology, University of Florence, Pisa
| | - P Boraschi
- Department of Diagnostic and Interventional Radiology, and Nuclear Medicine, Azienda Ospedaliero-Universitaria Pisana, Pisa
| | - F Donati
- Department of Diagnostic and Interventional Radiology, and Nuclear Medicine, Azienda Ospedaliero-Universitaria Pisana, Pisa
| | - L Urbani
- General Surgery, Azienda Ospedaliero-Universitaria Pisana, Pisa
| | - S Lonardi
- Department of Oncology, Veneto Institute of Oncology IOV - IRCCS, Padua
| | - F Bergamo
- Department of Oncology, Veneto Institute of Oncology IOV - IRCCS, Padua
| | - K Cerma
- Department of Oncology, Veneto Institute of Oncology IOV - IRCCS, Padua
| | - G Ramondo
- Radiology Unit, Veneto Institute of Oncology IOV - IRCCS, Padua
| | - F E D'Amico
- General Surgery 2, Department of Surgical Oncological and Gastroenterological Sciences (DISCOG), University of Padua, Padua
| | - L Salvatore
- Medical Oncology Unit, Comprehensive Cancer Center, Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Rome; Medical Oncology Unit, Università Cattolica del Sacro Cuore, Rome
| | - G Valente
- Medical Oncology Unit, Comprehensive Cancer Center, Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Rome; Medical Oncology Unit, Università Cattolica del Sacro Cuore, Rome
| | - B Barbaro
- Diagnostic and General Interventional Radiology, Fondazione Policlinico Universitario Agostino Gemelli, IRCCS, Rome
| | - F Giuliante
- General and Hepatobiliary Surgery, Fondazione Policlinico Universitario Agostino Gemelli, IRCCS, Rome
| | - M Di Maio
- Department of Oncology, Università degli Studi di Torino, Turin, Italy
| | - G Masi
- Unit of Medical Oncology 2, Azienda Ospedaliero-Universitaria Pisana, Pisa; Department of Translational Research and New Technologies in Medicine, University of Pisa, Pisa
| | - C Cremolini
- Unit of Medical Oncology 2, Azienda Ospedaliero-Universitaria Pisana, Pisa; Department of Translational Research and New Technologies in Medicine, University of Pisa, Pisa.
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2
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Romano A, Balestrini L, Della Scala G, Chico L, Bertini A, Cangioli M, Ciapparelli F, Ciardella E, Congestrí C, Dinelli V, Donati F, Ficini M, Giovanetti C, Nannicini F, Pasquali A, Pieraccini A. Effects of a Nutraceutical Multicompound, with Probiotics, Hericium, PEA, and Undaria in Patients with Irritable Bowel Syndrome. J Diet Suppl 2024:1-11. [PMID: 38186311 DOI: 10.1080/19390211.2023.2296106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2024]
Abstract
Irritable bowel syndrome (IBS) is a functional gastrointestinal condition. Probiotics and other nutraceutical compounds can have specific indications in the context of IBS. A retrospective analysis was conducted on 123 IBS patients in order to evaluate the effects of an oral probiotic-based dietary supplement (Colicron, one cps/day for 4 wk) on stool consistency and pain intensity. Different time points were defined as follows: baseline (T0), 2 wk of treatment (T2), and 4 wk of treatment (T4). Stool consistency was assessed by using the Bristol Stool Scale. Pain intensity was evaluated by the Visual Analogue Scale (VAS). Patients who were initially categorized as normal retained regular bowel movements throughout the study. Both patients with constipation and diarrhea showed an improvement in the Bristol Stool Scale. The score increased from 1.5 ± 0.5 to 3.3 ± 0.7 (p < 0.001) and decreased from 6.5 ± 0.7 to 4.3 ± 0.9 (p < 0.001) at T4, respectively, compared to T0. The VAS score for pain in the pooled IBS patients improved from 6.7 ± 2.2 to 2.8 ± 1.9 at T0 vs T4 (p < 0.001), with a similar trend also observed when patients were categorized based on stool consistency: normal (from 5.2 ± 1.9 to 2.9 ± 1.7), constipation (from 7.5 ± 1.3 to 3.2 ± 2.2), and diarrhea (6.7 ± 2.3 to 2.5 ± 1.9) (p < 0.001).Colicron could be useful in symptom relief, reducing abdominal pain and improving stool consistency of IBS patients. However, further controlled clinical trials are needed to confirm these preliminary findings.
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Affiliation(s)
- Antonio Romano
- Gastroenterology Private Practitioner, GF. Medical Center, Pisa, Italy
| | | | | | - Lucia Chico
- Laboratori Aliveda srl, Crespina Lorenzana, Pisa, Italy
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3
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Noh K, Colazzo L, Urdaniz C, Lee J, Krylov D, Devi P, Doll A, Heinrich AJ, Wolf C, Donati F, Bae Y. Template-directed 2D nanopatterning of S = 1/2 molecular spins. Nanoscale Horiz 2023; 8:624-631. [PMID: 36752198 DOI: 10.1039/d2nh00375a] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Molecular spins are emerging platforms for quantum information processing. By chemically tuning their molecular structure, it is possible to prepare a robust environment for electron spins and drive the assembly of a large number of qubits in atomically precise spin-architectures. The main challenges in the integration of molecular qubits into solid-state devices are (i) minimizing the interaction with the supporting substrate to suppress quantum decoherence and (ii) controlling the spatial distribution of the spins at the nanometer scale to tailor the coupling among qubits. Herein, we provide a nanofabrication method for the realization of a 2D patterned array of individually addressable Vanadyl Phthalocyanine (VOPc) spin qubits. The molecular nanoarchitecture is crafted on top of a diamagnetic monolayer of Titanyl Phthalocyanine (TiOPc) that electronically decouples the electronic spin of VOPc from the underlying Ag(100) substrate. The isostructural TiOPc interlayer also serves as a template to regulate the spacing between VOPc spin qubits on a scale of a few nanometers, as demonstrated using scanning tunneling microscopy, X-ray circular dichroism, and density functional theory. The long-range molecular ordering is due to a combination of charge transfer from the metallic substrate and strain in the TiOPc interlayer, which is attained without altering the pristine VOPc spin characteristics. Our results pave a viable route towards the future integration of molecular spin qubits into solid-state devices.
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Affiliation(s)
- Kyungju Noh
- Center for Quantum Nanoscience (QNS), Institute of Basic Science (IBS), 03760 Seoul, Republic of Korea.
- Department of Physics, Ewha Womans University, 03760 Seoul, Republic of Korea
| | - Luciano Colazzo
- Center for Quantum Nanoscience (QNS), Institute of Basic Science (IBS), 03760 Seoul, Republic of Korea.
- Ewha Womans University, 03760 Seoul, Republic of Korea
| | - Corina Urdaniz
- Center for Quantum Nanoscience (QNS), Institute of Basic Science (IBS), 03760 Seoul, Republic of Korea.
- Ewha Womans University, 03760 Seoul, Republic of Korea
| | - Jaehyun Lee
- Center for Quantum Nanoscience (QNS), Institute of Basic Science (IBS), 03760 Seoul, Republic of Korea.
- Department of Physics, Ewha Womans University, 03760 Seoul, Republic of Korea
| | - Denis Krylov
- Center for Quantum Nanoscience (QNS), Institute of Basic Science (IBS), 03760 Seoul, Republic of Korea.
- Ewha Womans University, 03760 Seoul, Republic of Korea
| | - Parul Devi
- Center for Quantum Nanoscience (QNS), Institute of Basic Science (IBS), 03760 Seoul, Republic of Korea.
- Ewha Womans University, 03760 Seoul, Republic of Korea
| | - Andrin Doll
- Swiss Light Source (SLS), Paul Scherrer Institut (PSI), 5232 Villigen, Switzerland
| | - Andreas J Heinrich
- Center for Quantum Nanoscience (QNS), Institute of Basic Science (IBS), 03760 Seoul, Republic of Korea.
- Department of Physics, Ewha Womans University, 03760 Seoul, Republic of Korea
| | - Christoph Wolf
- Center for Quantum Nanoscience (QNS), Institute of Basic Science (IBS), 03760 Seoul, Republic of Korea.
- Department of Physics, Ewha Womans University, 03760 Seoul, Republic of Korea
| | - Fabio Donati
- Center for Quantum Nanoscience (QNS), Institute of Basic Science (IBS), 03760 Seoul, Republic of Korea.
- Department of Physics, Ewha Womans University, 03760 Seoul, Republic of Korea
| | - Yujeong Bae
- Center for Quantum Nanoscience (QNS), Institute of Basic Science (IBS), 03760 Seoul, Republic of Korea.
- Department of Physics, Ewha Womans University, 03760 Seoul, Republic of Korea
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4
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Kim J, Noh K, Chen Y, Donati F, Heinrich AJ, Wolf C, Bae Y. Anisotropic Hyperfine Interaction of Surface-Adsorbed Single Atoms. Nano Lett 2022; 22:9766-9772. [PMID: 36317830 PMCID: PMC9756343 DOI: 10.1021/acs.nanolett.2c02782] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2022] [Revised: 10/20/2022] [Indexed: 06/16/2023]
Abstract
Hyperfine interactions have been widely used in material science, organic chemistry, and structural biology as a sensitive probe to local chemical environments. However, traditional ensemble measurements of hyperfine interactions average over a macroscopic number of spins with different geometrical locations and nuclear isotopes. Here, we use a scanning tunneling microscope (STM) combined with electron spin resonance (ESR) to measure hyperfine spectra of hydrogenated-Ti on MgO/Ag(100) at low-symmetry binding sites and thereby determine the isotropic and anisotropic hyperfine interactions at the single-atom level. Combining vector-field ESR spectroscopy with STM-based atom manipulation, we characterize the full hyperfine tensors of 47Ti and 49Ti and identify significant spatial anisotropy of the hyperfine interactions for both isotopes. Density functional theory calculations reveal that the large hyperfine anisotropy arises from highly anisotropic distributions of the ground-state electron spin density. Our work highlights the power of ESR-STM-enabled single-atom hyperfine spectroscopy in revealing electronic ground states and atomic-scale chemical environments.
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Affiliation(s)
- Jinkyung Kim
- Center
for Quantum Nanoscience (QNS), Institute
for Basic Science (IBS), Seoul 03760, South Korea
- Department
of Physics, Ewha Womans University, Seoul 03760, South Korea
| | - Kyungju Noh
- Center
for Quantum Nanoscience (QNS), Institute
for Basic Science (IBS), Seoul 03760, South Korea
- Department
of Physics, Ewha Womans University, Seoul 03760, South Korea
| | - Yi Chen
- Center
for Quantum Nanoscience (QNS), Institute
for Basic Science (IBS), Seoul 03760, South Korea
- Ewha
Womans University, Seoul 03760, Republic of Korea
| | - Fabio Donati
- Center
for Quantum Nanoscience (QNS), Institute
for Basic Science (IBS), Seoul 03760, South Korea
- Department
of Physics, Ewha Womans University, Seoul 03760, South Korea
| | - Andreas J. Heinrich
- Center
for Quantum Nanoscience (QNS), Institute
for Basic Science (IBS), Seoul 03760, South Korea
- Department
of Physics, Ewha Womans University, Seoul 03760, South Korea
| | - Christoph Wolf
- Center
for Quantum Nanoscience (QNS), Institute
for Basic Science (IBS), Seoul 03760, South Korea
- Ewha
Womans University, Seoul 03760, Republic of Korea
| | - Yujeong Bae
- Center
for Quantum Nanoscience (QNS), Institute
for Basic Science (IBS), Seoul 03760, South Korea
- Department
of Physics, Ewha Womans University, Seoul 03760, South Korea
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5
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Voss SC, Yassin M, Grivel JC, Al Hmissi S, Allahverdi N, Nashwan A, Merenkov Z, Abdulla M, Al Malki A, Raynaud C, Elsaftawy W, Al Kaabi A, Donati F, Botre F, Mohamed Ali V, Georgakopoulos C, Al Maadheed M. Red blood cell derived extracellular vesicles during the process of autologous blood doping. Drug Test Anal 2022; 14:1984-1994. [PMID: 34453778 DOI: 10.1002/dta.3157] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2021] [Revised: 08/15/2021] [Accepted: 08/19/2021] [Indexed: 12/16/2022]
Abstract
The purpose of this pilot study was to investigate the effects of the transfusion of one erythrocyte concentrate on the number of circulating red blood cell extracellular vesicles (RBC-EVs) and their clearance time. Six, healthy volunteers donated their blood and were transfused with their RBC concentrate after 35-36 days of storage. One K2 EDTA and one serum sample were collected before donation, at four timepoints after donation and at another six timepoints after transfusion. RBC-EVs were analyzed on a Cytek Aurora flow cytometer. A highly significant increase (p < 0.001) of RBC-EVs from an average of 60.1 ± 19.8 (103 /μL) at baseline to 179.3 ± 84.7 (103 /μL) in the first 1-3 h after transfusion could be observed. Individual differences in the response to transfusion became apparent with one volunteer showing no increase and another an increased concentration at one timepoint after donation due to an influenza infection. We concluded that in an individualized passport approach, increased RBC-EVs might be considered as additional evidence when interpreting suspicious Athletes Biological Passport (ABPs) but for this additional research related to sample collection and transport processes as well as method development and harmonization would be necessary.
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Affiliation(s)
- S C Voss
- Anti-Doping Lab Qatar, Doha, Qatar
| | - M Yassin
- Hamad Medical Corporation, Doha, Qatar
| | - J C Grivel
- Sidra Medicine, Deep Phenotyping Core - Research Department, Doha, Qatar
| | | | | | - A Nashwan
- Hamad Medical Corporation, Doha, Qatar
| | | | - M Abdulla
- Hamad Medical Corporation, Doha, Qatar
| | | | - C Raynaud
- Sidra Medicine, Deep Phenotyping Core - Research Department, Doha, Qatar
| | | | | | - F Donati
- Anti-Doping Lab FMSI, Rome, Italy
| | - F Botre
- Anti-Doping Lab FMSI, Rome, Italy
| | - V Mohamed Ali
- Anti-Doping Lab Qatar, Doha, Qatar.,Centre for Metabolism and Inflammation, Division of Medicine, University College London, London, UK
| | | | - M Al Maadheed
- Anti-Doping Lab Qatar, Doha, Qatar.,Centre for Metabolism and Inflammation, Division of Medicine, University College London, London, UK
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6
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Bertolini D, Armillotta M, Bergamaschi L, Bertelli M, Di Nicola F, Sansonetti A, Donati F, Pizzi C, Galiè N. P412 SCAD: A PLANET TO DISCOVER IN THE UNIVERSE OF ACS. Eur Heart J Suppl 2022. [DOI: 10.1093/eurheartj/suac012.398] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Abstract
We hereby present the case of a 36–year–old woman with neither a history of cardiovascular disease nor any cardiovascular risk factors. Her only past medical history included a pregnancy from in vitro fertilization and endometriosis treated with progestin. She was admitted to A&E for sudden onset severe stabbing thoracic pain, which occurred at rest and was exacerbated by respiratory efforts, and with spontaneous resolution shortly after admission. While the ECG did not show any signs of ischemic, blood tests revealed a minor rise in inflammatory markers and a significant rise in troponin values, the latter consistent with acute myocardial injury.
Given the clinical suspicion of myopericarditis vs acute coronary syndrome, the patient was admitted to cardiac intensive care unit. Bedside echocardiogram performed shortly after admission demonstrated minor pericardial effusion and regional wall motion abnormalities. Thus, the patient underwent urgent coronary angiography, which revealed pronounced vasospasm at the proximal segment of the circumflex artery, which subsided after administration of nitrate, as well as spontaneous dissection of the mid left anterior descending artery extending to its apical branch. Since no high–risk features were identified (single vessel, mid–distal coronary lesion, no symptoms of persistent ischemia), revascularisation was not attempted and conservative therapy was undertaken. During the following days, genetic evaluation and further diagnostic tests were performed to exclude vascular abnormalities in other anatomical sites, which all resulted negative. Outpatient follow–up with CT coronary angiogram demonstrated full patency of left anterior descending artery with spontaneous resolution of the former dissection.
This clinical scenario represents an example of an uncommon and thus often overlooked cause of acute coronary syndrome with yet limited evidence on optimal therapeutic and follow–up strategies.
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Affiliation(s)
| | | | | | - M Bertelli
- POLICLINICO SANT‘ORSOLA–MALPIGHI, BOLOGNA
| | | | | | - F Donati
- POLICLINICO SANT‘ORSOLA–MALPIGHI, BOLOGNA
| | - C Pizzi
- POLICLINICO SANT‘ORSOLA–MALPIGHI, BOLOGNA
| | - N Galiè
- POLICLINICO SANT‘ORSOLA–MALPIGHI, BOLOGNA
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7
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Singha A, Sostina D, Wolf C, Ahmed SL, Krylov D, Colazzo L, Gargiani P, Agrestini S, Noh WS, Park JH, Pivetta M, Rusponi S, Brune H, Heinrich AJ, Barla A, Donati F. Mapping Orbital-Resolved Magnetism in Single Lanthanide Atoms. ACS Nano 2021; 15:16162-16171. [PMID: 34546038 DOI: 10.1021/acsnano.1c05026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Single lanthanide atoms and molecules are promising candidates for atomic data storage and quantum logic due to the long lifetime of their magnetic quantum states. Accessing and controlling these states through electrical transport requires precise knowledge of their electronic configuration at the level of individual atomic orbitals, especially of the outer shells involved in transport. However, no experimental techniques have so far shown the required sensitivity to probe single atoms with orbital selectivity. Here we resolve the magnetism of individual orbitals in Gd and Ho single atoms on MgO/Ag(100) by combining X-ray magnetic circular dichroism with multiplet calculations and density functional theory. In contrast to the usual assumption of bulk-like occupation of the different electronic shells, we establish a charge transfer mechanism leading to an unconventional singly ionized configuration. Our work identifies the role of the valence electrons in determining the quantum level structure and spin-dependent transport properties of lanthanide-based nanomagnets.
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Affiliation(s)
- Aparajita Singha
- Center for Quantum Nanoscience, Institute for Basic Science (IBS), Seoul 03760, Republic of Korea
- Ewha Womans University, Seoul 03760, Republic of Korea
- Max Planck Institute for Solid State Research, Stuttgart 70569, Germany
| | - Daria Sostina
- Center for Quantum Nanoscience, Institute for Basic Science (IBS), Seoul 03760, Republic of Korea
- Ewha Womans University, Seoul 03760, Republic of Korea
| | - Christoph Wolf
- Center for Quantum Nanoscience, Institute for Basic Science (IBS), Seoul 03760, Republic of Korea
- Ewha Womans University, Seoul 03760, Republic of Korea
| | - Safa L Ahmed
- Center for Quantum Nanoscience, Institute for Basic Science (IBS), Seoul 03760, Republic of Korea
- Department of Physics, Ewha Womans University, Seoul 03760, Republic of Korea
| | - Denis Krylov
- Center for Quantum Nanoscience, Institute for Basic Science (IBS), Seoul 03760, Republic of Korea
- Ewha Womans University, Seoul 03760, Republic of Korea
| | - Luciano Colazzo
- Center for Quantum Nanoscience, Institute for Basic Science (IBS), Seoul 03760, Republic of Korea
- Ewha Womans University, Seoul 03760, Republic of Korea
| | - Pierluigi Gargiani
- ALBA Synchrotron Light Source, Cerdanyola del Vallès, 08290 Catalonia, Spain
| | - Stefano Agrestini
- ALBA Synchrotron Light Source, Cerdanyola del Vallès, 08290 Catalonia, Spain
| | - Woo-Suk Noh
- MPPC-CPM, Max Planck POSTECH/Korea Research Initiative, Pohang 37673, Republic of Korea
| | - Jae-Hoon Park
- Department of Physics, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
| | - Marina Pivetta
- Institute of Physics, École Polytechnique Fédérale de Lausanne, Station 3, CH-1015 Lausanne, Switzerland
| | - Stefano Rusponi
- Institute of Physics, École Polytechnique Fédérale de Lausanne, Station 3, CH-1015 Lausanne, Switzerland
| | - Harald Brune
- Institute of Physics, École Polytechnique Fédérale de Lausanne, Station 3, CH-1015 Lausanne, Switzerland
| | - Andreas J Heinrich
- Center for Quantum Nanoscience, Institute for Basic Science (IBS), Seoul 03760, Republic of Korea
- Department of Physics, Ewha Womans University, Seoul 03760, Republic of Korea
| | - Alessandro Barla
- Istituto di Struttura della Materia (ISM), Consiglio Nazionale delle Ricerche (CNR), I-34149 Trieste, Italy
| | - Fabio Donati
- Center for Quantum Nanoscience, Institute for Basic Science (IBS), Seoul 03760, Republic of Korea
- Department of Physics, Ewha Womans University, Seoul 03760, Republic of Korea
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8
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Donati F, Pivetta M, Wolf C, Singha A, Wäckerlin C, Baltic R, Fernandes E, de Groot JG, Ahmed SL, Persichetti L, Nistor C, Dreiser J, Barla A, Gambardella P, Brune H, Rusponi S. Correlation between Electronic Configuration and Magnetic Stability in Dysprosium Single Atom Magnets. Nano Lett 2021; 21:8266-8273. [PMID: 34569802 DOI: 10.1021/acs.nanolett.1c02744] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Single atom magnets offer the possibility of magnetic information storage in the most fundamental unit of matter. Identifying the parameters that control the stability of their magnetic states is crucial to design novel quantum magnets with tailored properties. Here, we use X-ray absorption spectroscopy to show that the electronic configuration of dysprosium atoms on MgO(100) thin films can be tuned by the proximity of the metal Ag(100) substrate onto which the MgO films are grown. Increasing the MgO thickness from 2.5 to 9 monolayers induces a change in the dysprosium electronic configuration from 4f9 to 4f10. Hysteresis loops indicate long magnetic lifetimes for both configurations, however, with a different field-dependent magnetic stability. Combining these measurements with scanning tunneling microscopy, density functional theory, and multiplet calculations unveils the role of the adsorption site and charge transfer to the substrate in determining the stability of quantum states in dysprosium single atom magnets.
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Affiliation(s)
- Fabio Donati
- Center for Quantum Nanoscience, Institute for Basic Science (IBS), Seoul 03760, Republic of Korea
- Department of Physics, Ewha Womans University, Seoul 03760, Republic of Korea
| | - Marina Pivetta
- Institute of Physics, École Polytechnique Fédérale de Lausanne, Station 3, CH-1015 Lausanne, Switzerland
| | - Christoph Wolf
- Center for Quantum Nanoscience, Institute for Basic Science (IBS), Seoul 03760, Republic of Korea
- Ewha Womans University, Seoul 03760, Republic of Korea
| | - Aparajita Singha
- Center for Quantum Nanoscience, Institute for Basic Science (IBS), Seoul 03760, Republic of Korea
- Ewha Womans University, Seoul 03760, Republic of Korea
- Max Planck Institute for Solid State Research, 70569 Stuttgart, Germany
| | - Christian Wäckerlin
- Institute of Physics, École Polytechnique Fédérale de Lausanne, Station 3, CH-1015 Lausanne, Switzerland
- Surface Science and Coating Technologies, Empa - Swiss Federal Laboratories for Materials Research and Technology, Überlandstrasse 129, 8600 Dübendorf, Switzerland
| | - Romana Baltic
- Institute of Physics, École Polytechnique Fédérale de Lausanne, Station 3, CH-1015 Lausanne, Switzerland
| | - Edgar Fernandes
- Institute of Physics, École Polytechnique Fédérale de Lausanne, Station 3, CH-1015 Lausanne, Switzerland
| | - Jean-Guillaume de Groot
- Institute of Physics, École Polytechnique Fédérale de Lausanne, Station 3, CH-1015 Lausanne, Switzerland
| | - Safa Lamia Ahmed
- Center for Quantum Nanoscience, Institute for Basic Science (IBS), Seoul 03760, Republic of Korea
- Department of Physics, Ewha Womans University, Seoul 03760, Republic of Korea
| | - Luca Persichetti
- Department of Materials, ETH Zurich, Hönggerbergring 64, CH-8093 Zurich, Switzerland
- Department of Sciences, Roma Tre University, I-00146, Roma, Italy
| | - Corneliu Nistor
- Department of Materials, ETH Zurich, Hönggerbergring 64, CH-8093 Zurich, Switzerland
| | - Jan Dreiser
- Swiss Light Source (SLS), Paul Scherrer Institute (PSI), CH-5232 Villigen PSI, Switzerland
| | - Alessandro Barla
- Istituto di Struttura della Materia (ISM), Consiglio Nazionale delle Ricerche (CNR), I-34149 Trieste, Italy
| | - Pietro Gambardella
- Department of Materials, ETH Zurich, Hönggerbergring 64, CH-8093 Zurich, Switzerland
| | - Harald Brune
- Institute of Physics, École Polytechnique Fédérale de Lausanne, Station 3, CH-1015 Lausanne, Switzerland
| | - Stefano Rusponi
- Institute of Physics, École Polytechnique Fédérale de Lausanne, Station 3, CH-1015 Lausanne, Switzerland
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9
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Armillotta M, Sansonetti A, Angeli F, Fabrizio M, Stefanizzi A, Bergamaschi L, Magnani I, Donati F, Toniolo S, Paolisso P, Foa' A, Rinaldi A, Casella G, Galie' N, Pizzi C. Prognostic role of diagnostic criteria of acute myocardial infarction. Eur Heart J 2021. [DOI: 10.1093/eurheartj/ehab724.1347] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
The term acute myocardial infarction (AMI) reflects cell death of cardiac myocytes caused by ischaemia. The Fourth Universal Definition of Myocardial Infarction (UDMI) defined AMI by a typical rise and fall in the level of biochemical markers of myocardial necrosis together with criteria of myocardial ischaemia. However, the prognostic role of each single diagnostic criteria has never been explored.
Purpose
To evaluate the prognostic role of the different diagnostic criteria of AMI according to the Fourth UDMI.
Methods
We enrolled all consecutive patients with AMI admitted from 2016 to 2019. We used a combination of criteria, according to the current ESC guidelines, to meet the diagnosis, namely the detection of an increase and/or decrease of high-sensitivity cardiac troponin I, with at least one value above the 99th percentile of the upper reference limit and at least one of the following: symptoms of ischaemia; ECG changes (new ST-T changes or new LBBB); development of pathological Q waves in the ECG; imaging evidence of new loss of viable myocardium or new regional wall motion abnormality, in our study evaluated by transthoracic echocardiogram. All-cause mortality and a composite endpoint of all-cause mortality, re-hospitalization for heart failure and myocardial re-infarction were collected. The predictive value of diagnostic criteria alone and its association were evaluated using Kaplan-Meier survival curves and subsequent Cox-regression analysis to find independent predictors of adverse events.
Results
2386 patients were evaluated. The median follow-up time was 23.3±14.5 months. The total number of events was 703 (29.3%). Kaplan-Meier curves showed that major adverse cardiac events (MACE) were statistically different depending on the diagnostic criteria of AMI at admission. Particularly, clinical criteria alone showed a better predictive value (p<0.001) than other diagnostic AMI criteria. Multivariable Cox-regression model demonstrated that clinical criteria was the independent predictor of good prognosis in patients with AMI (HR=0.43; CI 95% 0.28–0.67; p<0.001). Conversely, the others diagnostic criteria (electrocardiographic and echocardiographic) and the combination of all diagnostic criteria were not independent prognostic factors of MACE (HR=1.1 CI 95% 0.6–2.4, p=0.6; HR=1.1 CI 95% 0.7–1.2, p=0.6; HR=0.9 CI 95% 0.7–1.0, p=0.8 respectively).
Conclusions
Our data suggest that the prognosis is considerably better among patients with a diagnosis of AMI if clinical criteria alone are present at admission. We also demonstrated that clinical criteria are a strong prognostic predictor of good outcomes in patients with AMI. We hypothesize that the absence of electrocardiographic and echocardiographic alterations could indirectly indicate a smaller infarct sizes that contribute to patients' outcome.
Funding Acknowledgement
Type of funding sources: Public hospital(s). Main funding source(s): None
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Affiliation(s)
- M Armillotta
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - A Sansonetti
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - F Angeli
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - M Fabrizio
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - A Stefanizzi
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - L Bergamaschi
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - I Magnani
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - F Donati
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - S Toniolo
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - P Paolisso
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - A Foa'
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - A Rinaldi
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - G Casella
- Maggiore Hospital, Cardiology Department, Bologna, Italy
| | - N Galie'
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - C Pizzi
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
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10
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Orzalkiewicz M, Donati F, Santona L, Marcelli C, Chietera F, Bendandi F, Bruno AG, Ghetti G, Taglieri N, Palmerini T, Marrozzini C, Galie N, Saia F. Management strategies for acutely decompensated aortic stenosis. Eur Heart J 2021. [DOI: 10.1093/eurheartj/ehab724.2199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Background
Uncertainty exists over the optimal treatment strategy for patients presenting with acutely decompensated severe aortic stenosis (AS). The available options include a bridging balloon aortic valvuloplasty (BAV) or a direct transcatheter aortic valve implantation (TAVI).
Purpose
Our study compares TAVI outcomes in patients treated with two different strategies in acutely decompensated severe AS: bridged TAVI vs direct TAVI.
Methods
In this observational study all patients admitted with decompensated severe AS who underwent balloon aortic balloon valvuloplasty (BAV) and/or TAVI on the index admission were included. Comparison was made between bridged TAVI group (defined as initial BAV followed by TAVI) and direct TAVI group (TAVI on the index admission without bridging BAV). For this analysis we excluded patients in cardiogenic shock. Baseline characteristics, echocardiographic and periprocedural data were recorded in hospital database. Major adverse cardiovascular events (MACE) were defined as death, major bleeding, rehospitalisation for heart failure, or stroke). The follow-up data was obtained by outpatient visits and/or telephone calls.
Results
178 patients with acutely decompensated AS were analysed: 58 bridged TAVI, 23 direct TAVI, 9 bridged SAVR and 88 destination BAV (defined as BAV non followed by a definite treatment). There was no statistically significant difference between bridged TAVI and direct TAVI group in mean age (83.6±6.6 vs 80.4±8.3 years), the prevalence major comorbidities (coronary, respiratory, neurological or peripheral vascular disease), renal function (eGFR 43.4±18.9 vs 45.2±20.9 ml/min/m2), the mean LV ejection fraction (53.4±13.8 vs 48.6±14.6%) or aortic valve gradient (39.4±13.0 vs 34.1±12.3mmHg), respectively. Direct TAVI patients had a higher mean surgical risk scores (STS 6.1±3.7 vs 9.1±7.0%, logES 18.8±11.5 vs 30.8±20.9%, p=0.01) and higher prevalence of significant aortic regurgitation (5% vs 43%, p=0.0001). The femoral TAVI access was used in 98% of bridged and 78% of direct TAVI patients (p=0.006). The estimated 1-year survival and 1-year MACE-free survival did not differ significantly between the bridged TAVI and direct TAVI groups (86.8% vs 78.3%, p=0.20 and 79.7% vs 64.2%, p=0.11, respectively).
Conclusions
A large proportion of patients admitted with acutely decompensated AS were not eligible for definite treatment. There is no difference in procedural success, 1-year all-cause mortality and 1-year major adverse cardiovascular events between the bridged TAVI or direct TAVI strategies in acute decompensated aortic stenosis allowing to personalize treatment strategy for individual patient.
Funding Acknowledgement
Type of funding sources: None. Table 1. Clinical and procedural data
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Affiliation(s)
| | - F Donati
- St. Orsola-Malpighi University Hospital, Bologna, Italy
| | - L Santona
- St. Orsola-Malpighi University Hospital, Bologna, Italy
| | - C Marcelli
- St. Orsola-Malpighi University Hospital, Bologna, Italy
| | - F Chietera
- St. Orsola-Malpighi University Hospital, Bologna, Italy
| | - F Bendandi
- St. Orsola-Malpighi University Hospital, Bologna, Italy
| | - A G Bruno
- St. Orsola-Malpighi University Hospital, Bologna, Italy
| | - G Ghetti
- St. Orsola-Malpighi University Hospital, Bologna, Italy
| | - N Taglieri
- St. Orsola-Malpighi University Hospital, Bologna, Italy
| | - T Palmerini
- St. Orsola-Malpighi University Hospital, Bologna, Italy
| | - C Marrozzini
- St. Orsola-Malpighi University Hospital, Bologna, Italy
| | - N Galie
- St. Orsola-Malpighi University Hospital, Bologna, Italy
| | - F Saia
- St. Orsola-Malpighi University Hospital, Bologna, Italy
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11
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Singha A, Willke P, Bilgeri T, Zhang X, Brune H, Donati F, Heinrich AJ, Choi T. Engineering atomic-scale magnetic fields by dysprosium single atom magnets. Nat Commun 2021; 12:4179. [PMID: 34234133 PMCID: PMC8263604 DOI: 10.1038/s41467-021-24465-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2021] [Accepted: 06/16/2021] [Indexed: 11/08/2022] Open
Abstract
Atomic scale engineering of magnetic fields is a key ingredient for miniaturizing quantum devices and precision control of quantum systems. This requires a unique combination of magnetic stability and spin-manipulation capabilities. Surface-supported single atom magnets offer such possibilities, where long temporal and thermal stability of the magnetic states can be achieved by maximizing the magnet/ic anisotropy energy (MAE) and by minimizing quantum tunnelling of the magnetization. Here, we show that dysprosium (Dy) atoms on magnesium oxide (MgO) have a giant MAE of 250 meV, currently the highest among all surface spins. Using a variety of scanning tunnelling microscopy (STM) techniques including single atom electron spin resonance (ESR), we confirm no spontaneous spin-switching in Dy over days at ≈ 1 K under low and even vanishing magnetic field. We utilize these robust Dy single atom magnets to engineer magnetic nanostructures, demonstrating unique control of magnetic fields with atomic scale tunability.
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Affiliation(s)
- A Singha
- Center for Quantum Nanoscience, Institute for Basic Science (IBS), Seoul, Republic of Korea.
- Ewha Womans University, Seoul, Republic of Korea.
- Max Planck Institute for Solid State Research, Stuttgart, Germany.
| | - P Willke
- Center for Quantum Nanoscience, Institute for Basic Science (IBS), Seoul, Republic of Korea
- Ewha Womans University, Seoul, Republic of Korea
- Physikalisches Institut, Karlsruhe Institute of Technology, Karlsruhe, Germany
| | - T Bilgeri
- Institute of Physics, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
| | - X Zhang
- Center for Quantum Nanoscience, Institute for Basic Science (IBS), Seoul, Republic of Korea
- Ewha Womans University, Seoul, Republic of Korea
| | - H Brune
- Institute of Physics, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
| | - F Donati
- Center for Quantum Nanoscience, Institute for Basic Science (IBS), Seoul, Republic of Korea
- Department of Physics, Ewha Womans University, Seoul, Republic of Korea
| | - A J Heinrich
- Center for Quantum Nanoscience, Institute for Basic Science (IBS), Seoul, Republic of Korea.
- Department of Physics, Ewha Womans University, Seoul, Republic of Korea.
| | - T Choi
- Center for Quantum Nanoscience, Institute for Basic Science (IBS), Seoul, Republic of Korea.
- Department of Physics, Ewha Womans University, Seoul, Republic of Korea.
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12
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Bergamaschi L, Donati F, Paolisso P, Bartoli L, Angeli F, Stefanizzi A, Toniolo S, Magnani I, D'Angelo E, Foa' A, Rinaldi A, Martignani C, Biffi M, Pizzi C, Galie' N. Admission blood glucose level as an ischemic stroke risk modifier in patients with new-onset non-valvular atrial fibrillation. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.0526] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
Several scores have been proposed to assess the stroke risk in patients with non-valvular atrial fibrillation (NVAF). However, type 2 diabetes mellitus (T2DM) is considered a major stroke risk factor regardless of glycemic control. Whether basal blood glucose level modifies the risk of stroke in NVAF is still unclear.
Purpose
To evaluate the risk of ischemic stroke according to the presence of T2DM and admission blood glucose (ABG) level in patients with new-onset NVAF starting direct oral anticoagulants (DOACs).
Methods
We analyzed all consecutive patients with NVAF at our outpatient clinic from January to December 2018. The study population was constituted by 1014 patients with new-onset NVAF starting DOACs. Baseline characteristics were evaluated in the overall cohort whereas outcomes were assessed for 915 patients. The median follow-up time was 19.6±12.9 months.
Results
Overall, 50.3% were male with a mean age of 73.9±12.5 years. Diabetic NVAF patients were more frequently male (p=0.04) with higher prevalence of dyslipidemia (p<0.001), hypertension (p<0.001), severe renal impairment (p=0.02), peripheral vasculopathy (p=0.007) and history of myocardial infarction (p<0.001) compared to non-diabetic NVAF. Conversely, no differences were observed between subgroups in terms of age (p=0.8). Baseline blood glucose level was significantly higher in the diabetic NVAF population (160±67 mg/dL vs 119±39 mg/dL; p<0.001). As expected, the mean CHA2DS2-VASc score was significantly higher in diabetic NVAF compared to non-diabetic group (4.7±1.4 vs 3.2±1.5; p<0.001).
During a 2 year-follow up period, we collected 27 (3.0%) ischemic stroke. As expected, the rates of stroke were significantly higher in diabetic NVAF (7.6% vs 2.3%, p<0.001). Also, the ABG was significantly greater in NVAF who had an ischemic stroke compared to others (160±68 mg/dL vs 119±39 mg/dL, p=0.005). The incidence of stroke was almost five-time greater in NVAF with ABG level major than 150 mg/dl (9.8% vs 1.9%, p<0.001).
At multivariate Cox-regression model adjusted for age, sex and presence of T2DM, blood glucose level at admission was the only independent predictor of ischemic stroke at follow up (HR 1.01, 95% CI 1.001–1.02; p=0.03). Finally, another multivariate Cox-regression model, adjusted for the mean CHA2DS2-VASc score, showed that the ABG level still remained a strong independent predictor of ischemic stroke at follow up (HR 1.012, 95% CI 1.003–1.02; p=0.01).
Conclusions
Diabetic NVAF had a worse baseline profile and higher stroke risk compared to non-diabetic NVAF. Baseline blood glucose level was an independent predictor of stroke regardless of the presence of T2DM or stroke risk profile. These findings underline the role of basal blood glucose level as a potential stroke risk modifier and therefore emphasize the importance of its routine determination to better stratify the stroke risk in NVAF starting DOACs.
Funding Acknowledgement
Type of funding source: None
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Affiliation(s)
- L Bergamaschi
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - F Donati
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - P Paolisso
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - L Bartoli
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - F Angeli
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - A Stefanizzi
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - S Toniolo
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - I Magnani
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - E.C D'Angelo
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - A Foa'
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - A Rinaldi
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - C Martignani
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - M Biffi
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - C Pizzi
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - N Galie'
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
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13
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D'Angelo E, Paolisso P, Foa A, Bergamaschi L, Magnani I, Toniolo S, Donati F, Rinaldi A, Lovato L, Fanti S, Leone O, Rucci P, Pacini D, Galie N, Pizzi C. Diagnostic accuracy of cardiac computed tomography and 18F-fluorodeoxyglucose with positron emission tomography/computed tomography in cardiac masses. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.0294] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Background
Understanding the nature of cardiac masses represents a challenge for clinicians in order to select the appropriate therapeutic strategies. The diagnostic accuracy of cardiac computed tomography (CT) and 18F-fluorodeoxyglucose (18F-FDG) with positron emission tomography/CT (PET/CT) in identifying the nature of cardiac masses has not been evaluated before in a large population.
Purpose
To assess the diagnostic value of CT and 18F-FDG PET/CT in defining the nature of cardiac masses, integrating morphologic features and metabolic activity.
Methods
Out of 223 we selected a final cohort 60 patients which underwent cardiac CT scan and 18F-FDG PET/CT. All masses had histological certain, apart from thrombi, in which was defined radiologic resolution after adequate anticoagulant treatment. For each mass, eight morphologic CT signs and standardized uptake value (SUVmax, SUVmean), metabolic tumour volume (MTV) and total lesion glycolysis (TLG) in 18F-FDG PET, were evaluated.
Results
Twenty patients had benign cardiac masses and 40 patients malignant cardiac masses. Irregular tumour margins, pericardial effusion, invasions, solid nature of the mass, mass diameter, TC contrast up-take and pre-contrast characteristics were strongly associated with the malignant nature of cardiac masses (p<0.001). Additionally, the presence of at least four CT signs was able to discriminate malignancies, withsensitivity of 95% and specificity of 95% (AUC=0.988, 95% CI 0.969–1). The mean value of SUVmax, SUVmean, MTV and TLG was significantly higher in malignant cardiac masses than in benign lesions (p<0.001). ROC curve for diagnostic accuracy of 18F-FDG PET/CT parameters in detecting malignant lesions showed an excellent performance of SUV (AUC=0.948, 95% CI 0.891–1), MTV (AUC=0.928, 95% CI 0.841–1) and TLG (AUC=0.961, 95% CI 0.902–1).
Conclusions
In patients with cardiac masses, cardiac computed tomography and 18F-FDG PET/CT findings provide independent and incremental prognostic information regarding their nature. A systematic use of CT and 18F-FDG PET/CT is therefore useful for diagnostic and therapeutic purposes.
PET-CT evaluation of cardiac masses
Funding Acknowledgement
Type of funding source: Public Institution(s). Main funding source(s): S. Orsola Malpighi Hospital, University of Bologna
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Affiliation(s)
- E.C D'Angelo
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - P Paolisso
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - A Foa
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - L Bergamaschi
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - I Magnani
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - S Toniolo
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - F Donati
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - A Rinaldi
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - L Lovato
- University Hospital Sant'Orsola, Radiology Unit, Cardio-Thoracic-Vascular Department, S. Orsola Malpighi Hospital, University of Bolo, Bologna, Italy
| | - S Fanti
- Universitary Hospital Sant'Orsola, Institute of Nuclear Medicine, Department of Experimental, Diagnostic and Specialty Medicine, Univer, Bologna, Italy
| | - O Leone
- Universitary Hospital Sant'orsola Malpighi, Department of Pathology, University of Bologna, Azienda Ospedaliera S. Orsola-Malpighi of Bologna, I, Bologna, Italy
| | - P Rucci
- Universitary Hospital Sant'orsola Malpighi, Division of Hygiene and Biostatistics, Department of Biomedical and Neuromotor Sciences, Alma Mater, Bologna, Italy
| | - D Pacini
- University Hospital Policlinic S. Orsola-Malpighi, Cardiac Surgery Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - N Galie
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - C Pizzi
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
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14
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Magnani I, Toniolo S, Rinaldi A, Paolisso P, D'Angelo E, Bergamaschi L, Bartoli L, Donati F, Angeli F, Foa' A, Pizzi C, Galie' N. Coronary blood flow in myocardial infarction with nonobstructive coronary arteries. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.1802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Background
Myocardial infarction (MI) is mainly caused by atherosclerotic plaque thrombosis but several registries show that in 1–13% of cases MI occurs in the absence of obstructive coronary artery disease (MINOCA) utilizing the conventional cut-off of <50% stenosis. MINOCA is generally related to coronary arteries abnormalities (epicardial or microvascular dysfunction – MINOCA-co). However, non-coronary conditions may underlie MINOCA as a consequence of supply-demand mismatch (MINOCA-nco). The TIMI flow gradient (TFG) and the corrected TIMI frame count (CTFC) are established methods able to respectively provide a qualitative and semiquantitative estimation of epicardial blood flow at rest. No studies have yet evaluated these indices in patients with MINOCA.
Purpose
To evaluate the clinical characteristics of patients with MINOCA and the angiographic indices in MINOCA-co versus MINOCA-nco.
Methods
Among all consecutive patients undergoing coronary angiogram at our Centre for MI based on the 4th Definition of Myocardial Infarction, the ones showing <50% coronary artery stenosis were retrospectively analyzed; patients with previous coronary stenting were excluded from the study. According to the presence or absence of pre-specified criteria of supply-demand mismatch (SAP >180 mmHg, DAP >110 mmHg, HR >110 bpm, Hb <6 gr/dl, SatO2 <91% or P/F ratio <300), the study cohort was divided into MINOCA-nco and MINOCA-co, respectively. We defined as slow flow phenomenon a TFG < = 2 and/or a CTFC >40 for the left anterior descending artery, >27 for the right coronary artery and >24 for the left circumflex.
Results
453 patients were retrospectively evaluated and 112 (24.7%) met the inclusion criteria. Mean age was 68±13.2 years and 41 (36.6%) were males. MINOCA-co was the more prevalent entity accounting for 73 (65.2%) patients while 39 (34.8%) were MINOCA-nco. The two subgroups presented similar baseline characteristics with regards to gender and classic cardiovascular risk factors including hypertension, hypercholesterolemia, diabetes and smoking habit. Peripheral vasculopathy was more prevalent in MINOCA-nco patients (MINOCA-nco=15.4% vs. MINOCAco= 4.2%; p=0.04). Regarding the angiographic indices, there was no statistically significant difference in TFG between subgroups; conversely, the number of patients with a slow flow phenomenon as defined by CTFC was significantly higher in the MINOCA-nco group (MINOCAnco= 25.7% vs. MINOCA-co=9.8%; p=0.039).
Conclusions
Our data suggest that among patients with MINOCA clinical characteristics were not useful in differentiating between the two disease entities (MINOCA-nco vs. MINOCA-co). However, MINOCA-nco patients had higher coronary flow impairment as evaluated by CTFC. The pathophysiological reason is still not clear; we hypothesized that, in this clinical setting, an increased heart rate, systemic arterial pressure or low oxygen supply might worsen unbalanced coronary perfusion.
Funding Acknowledgement
Type of funding source: None
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Affiliation(s)
- I Magnani
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - S Toniolo
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - A Rinaldi
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - P Paolisso
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - E.C D'Angelo
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - L Bergamaschi
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - L Bartoli
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - F Donati
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - F Angeli
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - A Foa'
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - C Pizzi
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - N Galie'
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
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15
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Donati F, Toniolo S, Bergamaschi L, Paolisso P, D'Angelo E, Magnani I, Angeli F, Bartoli L, Stefanizzi A, Foa' A, Rinaldi A, Casella G, Pizzi C, Galie' N. Myocardial infarction with non-obstructive coronary artery disease: the prognostic role of infarct size predictors. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.1809] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
In patients with Acute Myocardial Infarction (AMI) the levels of cardiac troponin T and absolute neutrophil count have been shown to correlate with infarct scar size and left ventricular ejection fraction (LVEF) as well as conferring a risk for major cardiovascular adverse events (MACE). In the context of myocardial infarction with non-obstructive coronary arteries (MINOCA) the prognostic role of such indicators has never been explored.
Purpose
To evaluate the prognostic role of known myocardial infarct size indicators in a MINOCA population compared to patients with obstructive AMI (Ob – AMI).
Methods
Among 1990 patients admitted to our coronary care unit from 2016 to 2019 with AMI, we enrolled 186 consecutive MINOCA patients according to the current ESC diagnostic criteria. We compared troponin peak levels, absolute neutrophil count at the time of hospital admission and LVEF in MINOCA patients versus Ob–AMI. Furthermore we assessed the prognostic value of these indicators. All-cause mortality and a composite end - point of all-cause mortality and myocardial re-infarction were evaluated. The median follow-up time was 19.6±12.9 months.
Results
MINOCA patients were more frequently females (64,9% vs 35,1%; p<0.001), non-smokers (42,3% vs 61,8%; p<0.001) with a lower prevalence of diabetes (9.9% vs 23.7%; p<0.001) compared to the Ob-AMI population. Conversely, no differences were found in hypertension and dyslipidemia. As far as infarct size predictors are concerned, MINOCA patients showed lower levels of troponin value and absolute neutrophil count measured at the time of hospital admission (1838.27±601.0 ng/L vs 13543±3350.6 ng/L; p<0.001, 6.7±1.36x109/L vs 7.1±1.29x109/L; p=0.001, respectively). Moreover, these patients exhibited a higher LVEF (56.1±10% vs 49.3±11%; p<0.001) as compared to Ob-AMI.
Among our MINOCA patients, 13 (10.6%) all-cause deaths and 3 (4.3%) myocardial re-infarction were observed during follow-up. Multivariable Cox-regression model demonstrated that mean troponin level, absolute neutrophil count and LVEF were not independent predictors of MACE (HR = 1.0, 95% CI: 0.9–1.1, p=0.6; HR = 0.96, 95% CI: 0.9–1.1, p=0.187; HR = 0.9, 95% CI: 0.79–1.02, p=0. 12 respectively).
Conclusion
MINOCA patients show a similar prognosis compared to the worldwide AMI population.
However, in this study the outcome in the MINOCA population was not influenced by commonly used infarct size predictors, in contrast to what is observed in Ob-AMI patients. These results once again emphasize both the complexity of MINOCA patients and the importance of a better understanding of the different underlying pathophysiological mechanisms.
Funding Acknowledgement
Type of funding source: None
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Affiliation(s)
- F Donati
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - S Toniolo
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - L Bergamaschi
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - P Paolisso
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - E.C D'Angelo
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - I Magnani
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - F Angeli
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - L Bartoli
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - A Stefanizzi
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - A Foa'
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - A Rinaldi
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - G Casella
- Maggiore Hospital, Cardiology Department, Bologna, Italy
| | - C Pizzi
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - N Galie'
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
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16
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Bartoli L, Angeli F, Stefanizzi A, Paolisso P, Bergamaschi L, Toniolo S, Donati F, D'Angelo E, Magnani I, Foa' A, Rinaldi A, Martignani C, Biffi M, Pizzi C, Galie' N. The predictor role of worsening renal function in patients with new onset atrial fibrillation on direct oral anticoagulant. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.0652] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
Chronic kidney disease (CKD) is an important outcome predictor in patients with atrial fibrillation (AF). Moreover, renal function at baseline is used to guide oral anticoagulant (OA) selection and dosing at initial treatment. The prognostic role of worsening renal function (WRF) during treatment with direct oral anticoagulants (DOACS) has been poorly explored.
Purpose
To estimate the prognostic role of WRF in terms of major adverse cardiovascular events (MACEs) in a series of patients with newly diagnosed non-valvular AF (NVAF) treated with DOACs.
Methods
Among all patients with newly diagnosed NVAF and indication for OA between January 2017 and December 2018, we enrolled those treated with DOACs. Renal function at baseline and during follow-up was assessed with estimated glomerular filtration rates (eGFR). eGFR was calculated as a mean value of Cockcroft-Gault (CG), Modification of Diet in Renal Disease (MDRD) and Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) formulas. The hemorrhagic risk at baseline was estimated with the main available scores (HAS-BLED, ATRIA and ORBIT). WRF was defined as a decrease in eGFR of at least 20%. MACEs were evaluated according to the type of DOAC and the WRF. Major bleedings (MB) were defined according to the ISTH definition.
Results
The study population was constituted by 249 patients with newly diagnosed NVAF started on DOAC and followed for a median time of 14.1±8.6 months. Overall, WRF was observed in 58 cases (23.3%). Patients with WRF had significative higher rates of death (10.3% versus 3.1%, p=0.025) and MB (13.8% versus 4.7%, p=0.016). The incidence of bleeding events, acute coronary syndromes and stroke was not affected by WRF. Interestingly, CG formula better predicted the incidence of MB as compared to the other formulas (p=0.006). The type of DOAC did not significantly impact the observed renal impairment and had no effect on the occurrence of MACEs in patients showing WRF. The predictors of WRF were found to be age, female sex, low hemoglobin level and left ventricle end telediastolic volume. At multivariate analysis, WRF was identified as an independent predictor of MB (OR 3.1, 95% C.I, 1.12–8.58), regardless of the baseline bleeding risk.
Conclusion
This is the first prospective study to evaluate the impact of worsening renal function on cardiovascular events in patients with atrial fibrillation treated with DOACs. A significant WRF emerged as an independent predictor of death and MB. The specific DOAC did not affect either the entity of worsening renal function or the incidence of cardiovascular events.
Funding Acknowledgement
Type of funding source: None
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Affiliation(s)
- L Bartoli
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - F Angeli
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - A Stefanizzi
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - P Paolisso
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - L Bergamaschi
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - S Toniolo
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - F Donati
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - E.C D'Angelo
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - I Magnani
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - A Foa'
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - A Rinaldi
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - C Martignani
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - M Biffi
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - C Pizzi
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - N Galie'
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
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17
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Paolisso P, Donati F, Bergamaschi L, Toniolo S, D'Angelo E, Magnani I, Angeli F, Bartoli L, Stefanizzi A, Foa' A, Rinaldi A, Casella G, Taglieri N, Pizzi C, Galie' N. Impact of type 2 diabetes mellitus and blood glucose admission levels in patients with myocardial infarction with non obstructive coronary artery disease (MINOCA). Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.1808] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Background
Myocardial infarction with non-obstructive coronary arteries (MINOCA) is a heterogeneous clinically entity and represents 5% to 10% of all patients with myocardial infarction (MI). Besides type 2 diabetes mellitus (DM), which is a common comorbidity in patients hospitalized for an acute coronary syndrome, high glucose levels (HGL) at admission are frequently observed in this context. The risk of major adverse cardiovascular events following acute coronary syndrome is increased in people with DM and HGL. However, evidence regarding diabetes and high glucose level among MINOCA patients is lacking.
Purpose
To examine the incidence of major adverse cardiovascular events (MACEs) in diabetic and non-diabetic MINOCA patients as well as according to HGL at presentation.
Methods
Among 1995 patients with acute MI admitted to our coronary care unit from 2016 to 2018, we enrolled 186 consecutive MINOCA patients according to the current ESC diagnostic criteria. HGL at admission was defined as serum glucose level above 180 mg/dl. All-cause mortality and a composite end-point of all-cause mortality and myocardial re-infarction were compared. The median follow-up time was 19.6±12.9 months.
Results
Diabetic MINOCA patients were older (mean age 75.5±9.6 vs 66.5±14.7; p=0.002) and with higher prevalence of hypertension (p=0.016). Conversely, there were no significant differences in gender, BMI, dyslipidemia and atrial fibrillation. Similarly, no significant differences were observed regarding clinical and ECG presentation, echocardiographic features and laboratory tests. The rates of death (30.8% vs 8.3%; p=0.013) and MACEs (22.2% vs 6.8%; p=0.025) were significantly higher in MINOCA-DM patients; conversely, no significant differences were observed for re-MI (p=0.58). At multivariate regression model adjusted for age and sex, type 2 DM was not an independent predictor of all cause deaths (p=0.36) and MACE (p=0.24).
Patients with admission HGL had similar baseline characteristics, cardiovascular risk factors, clinical presentations, echocardiographic features and troponin values as compared to patients with no-HGL. HGL at admission was associated with higher incidence of all-cause-death (p<0.001) and MACE (p=0.003) during follow-up compared to patients with no HGL; conversely, no significant differences were observed in the incidence of re-MI (p=0.7). Multivariate analysis adjusted for age and sex demonstrated that HGL was an independent predictor of death (HR 6.25; CI 1.64–23.85; p=0.007) and MACEs (HR 6.17; CI 1.79–21.23, p=0.004).
Conclusion
In MINOCA patients, HGL was an independent risk factor for both MACEs and death while type 2 DM was not correlated with these hard endpoints. As a consequence, HGL could have a still unexplored pathophysiological role in MINOCA. Properly powered randomized trials are warranted.
Funding Acknowledgement
Type of funding source: None
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Affiliation(s)
- P Paolisso
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - F Donati
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - L Bergamaschi
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - S Toniolo
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - E.C D'Angelo
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - I Magnani
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - F Angeli
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - L Bartoli
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - A Stefanizzi
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - A Foa'
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - A Rinaldi
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - G Casella
- Maggiore Hospital, Cardiology Department, Bologna, Italy
| | - N Taglieri
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - C Pizzi
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - N Galie'
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
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18
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Paolisso P, Foa' A, D'Angelo E, Saturi G, Bergamaschi L, Toniolo S, Magnani I, Bartoli L, Angeli F, Donati F, Stefanizzi A, Rinaldi A, Pacini D, Pizzi C, Galie' N. Outcomes in patients with cardiac masses: the underestimated burden of pseudotumours. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.2164] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Background
Cardiac masses (CMs) include benign and malignant formations. So far, clinical presentation and prognosis have been reported only in small series without discriminating between subtypes. We investigated the clinical presentation and long-term prognosis of patients with cardiac masses stratifying our results according to the lesions' nature.
Methods
We enrolled all consecutive patients admitted to our Institution between 1999 and 2018 with imaging evidence of CMs. Definitive diagnosis was achieved by histologic examination or by radiological evidence of thrombotic resolution after anticoagulant treatment. The study population was classified as benign or malignant and subsequently into 4 subtypes: pseudo-tumours, primary benign tumours, primary malignant tumours and secondary tumours. Cardiovascular and non-cardiovascular mortality was described.
Results
We identified 172 patients with CMs, 125 benign and 47 malignant. Benign lesions were often incidentally diagnosed in the left heart chambers whereas malignancies were usually detected in the pericardium and right sections, resulting in more advanced symptoms. Over time – median follow-up of 48 months - survival of patients with benign formations was three-fold greater than patients with malignancies (p<0.001) with no differences in cardiovascular mortality. Patients with pseudo-tumours showed a significantly lower survival than primary benign tumours (p=0.018) while no difference was found within the malignant stratum between primary and secondary neoplasms.
Conclusions
CMs are a heterogeneous entity where advanced symptoms and a pericardial involvement suggest malignant forms, which exhibit a poor outcome. Among patients with benign lesions, pseudo-tumours were associated with reduced survival, supposedly as a consequence of the different underlying conditions.
Funding Acknowledgement
Type of funding source: None
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Affiliation(s)
- P Paolisso
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - A Foa'
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - E.C D'Angelo
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - G Saturi
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - L Bergamaschi
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - S Toniolo
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - I Magnani
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - L Bartoli
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - F Angeli
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - F Donati
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - A Stefanizzi
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - A Rinaldi
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - D Pacini
- University Hospital Policlinic S. Orsola-Malpighi, Cardiac Surgery Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - C Pizzi
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
| | - N Galie'
- University Hospital Policlinic S. Orsola-Malpighi, Cardiology, Department of Experimental Diagnostic and Specialty Medicine, Bologna, Italy
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19
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Donati F, Rusponi S, Stepanow S, Persichetti L, Singha A, Juraschek DM, Wäckerlin C, Baltic R, Pivetta M, Diller K, Nistor C, Dreiser J, Kummer K, Velez-Fort E, Spaldin NA, Brune H, Gambardella P. Unconventional Spin Relaxation Involving Localized Vibrational Modes in Ho Single-Atom Magnets. Phys Rev Lett 2020; 124:077204. [PMID: 32142323 DOI: 10.1103/physrevlett.124.077204] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Revised: 12/20/2019] [Accepted: 01/17/2020] [Indexed: 06/10/2023]
Abstract
We investigate the spin relaxation of Ho single atom magnets on MgO/Ag(100) as a function of temperature and magnetic field. We find that the spin relaxation is thermally activated at low field, while it remains larger than 1000 s up to 30 K and 8 T. This behavior contrasts with that of single molecule magnets and bulk paramagnetic impurities, which relax faster at high field. Combining our results with density functional theory, we rationalize this unconventional behavior by showing that local vibrations activate a two-phonon Raman process with a relaxation rate that peaks near zero field and is suppressed at high field. Our work shows the importance of these excitations in the relaxation of axially coordinated magnetic atoms.
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Affiliation(s)
- F Donati
- Center for Quantum Nanoscience, Institute for Basic Science (IBS), 03760 Seoul, Republic of Korea
- Institute of Physics, École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
- Department of Physics, Ewha Womans University, Seoul 03760, Republic of Korea
| | - S Rusponi
- Institute of Physics, École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | - S Stepanow
- Department of Materials, ETH Zurich, Hönggerbergring 64, CH-8093 Zurich, Switzerland
| | - L Persichetti
- Department of Materials, ETH Zurich, Hönggerbergring 64, CH-8093 Zurich, Switzerland
- Department of Sciences, Roma Tre University, I-00146, Roma, Italy
| | - A Singha
- Center for Quantum Nanoscience, Institute for Basic Science (IBS), 03760 Seoul, Republic of Korea
- Institute of Physics, École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
- Department of Physics, Ewha Womans University, Seoul 03760, Republic of Korea
| | - D M Juraschek
- Department of Materials, ETH Zurich, Hönggerbergring 64, CH-8093 Zurich, Switzerland
- Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA
| | - C Wäckerlin
- Institute of Physics, École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
- Institute of Physics of the Czech Academy of Sciences, Cukrovarnická 10, 16200 Prague 6, Czech Republic
| | - R Baltic
- Institute of Physics, École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | - M Pivetta
- Institute of Physics, École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | - K Diller
- Institute of Physics, École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | - C Nistor
- Department of Materials, ETH Zurich, Hönggerbergring 64, CH-8093 Zurich, Switzerland
| | - J Dreiser
- Swiss Light Source (SLS), Paul Scherrer Institute (PSI), CH-5232 Villigen PSI, Switzerland
| | - K Kummer
- European Synchrotron Radiation Facility (ESRF), F-38043 Grenoble, France
| | - E Velez-Fort
- European Synchrotron Radiation Facility (ESRF), F-38043 Grenoble, France
| | - N A Spaldin
- Department of Materials, ETH Zurich, Hönggerbergring 64, CH-8093 Zurich, Switzerland
| | - H Brune
- Institute of Physics, École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | - P Gambardella
- Department of Materials, ETH Zurich, Hönggerbergring 64, CH-8093 Zurich, Switzerland
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20
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Studniarek M, Wäckerlin C, Singha A, Baltic R, Diller K, Donati F, Rusponi S, Brune H, Lan Y, Klyatskaya S, Ruben M, Seitsonen AP, Dreiser J. Understanding the Superior Stability of Single-Molecule Magnets on an Oxide Film. Adv Sci (Weinh) 2019; 6:1901736. [PMID: 31763154 PMCID: PMC6864999 DOI: 10.1002/advs.201901736] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Revised: 09/05/2019] [Indexed: 05/12/2023]
Abstract
The stability of magnetic information stored in surface adsorbed single-molecule magnets is of critical interest for applications in nanoscale data storage or quantum computing. The present study combines X-ray magnetic circular dichroism, density functional theory and magnetization dynamics calculations to gain deep insight into the substrate dependent relevant magnetization relaxation mechanisms. X-ray magnetic circular dichroism reveals the opening of a butterfly-shaped magnetic hysteresis of DyPc2 molecules on magnesium oxide and a closed loop on the bare silver substrate, while density functional theory shows that the molecules are only weakly adsorbed in both cases of magnesium oxide and silver. The enhanced magnetic stability of DyPc2 on the oxide film, in conjunction with previous experiments on the TbPc2 analogue, points to a general validity of the magnesium oxide induced stabilization effect. Magnetization dynamics calculations reveal that the enhanced magnetic stability of DyPc2 and TbPc2 on the oxide film is due to the suppression of two-phonon Raman relaxation processes. The results suggest that substrates with low phonon density of states are beneficial for the design of spintronics devices based on single-molecule magnets.
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Affiliation(s)
- Michał Studniarek
- Swiss Light SourcePaul Scherrer Institut (PSI)CH‐5232VilligenSwitzerland
| | - Christian Wäckerlin
- Institute of Physics (IPHYS)École Polytechnique Fédérale de Lausanne (EPFL)Station 3CH‐1015LausanneSwitzerland
- Institute of PhysicsThe Czech Academy of SciencesCukrovarnická 10CZ‐162 00Prague 6Czech Republic
| | - Aparajita Singha
- Institute of Physics (IPHYS)École Polytechnique Fédérale de Lausanne (EPFL)Station 3CH‐1015LausanneSwitzerland
- Center for Quantum NanoscienceInstitute for Basic Science (IBS)03760SeoulRepublic of Korea
- Department of PhysicsEwha Womans University03760SeoulRepublic of Korea
| | - Romana Baltic
- Institute of Physics (IPHYS)École Polytechnique Fédérale de Lausanne (EPFL)Station 3CH‐1015LausanneSwitzerland
| | - Katharina Diller
- Institute of Physics (IPHYS)École Polytechnique Fédérale de Lausanne (EPFL)Station 3CH‐1015LausanneSwitzerland
| | - Fabio Donati
- Institute of Physics (IPHYS)École Polytechnique Fédérale de Lausanne (EPFL)Station 3CH‐1015LausanneSwitzerland
- Center for Quantum NanoscienceInstitute for Basic Science (IBS)03760SeoulRepublic of Korea
- Department of PhysicsEwha Womans University03760SeoulRepublic of Korea
| | - Stefano Rusponi
- Institute of Physics (IPHYS)École Polytechnique Fédérale de Lausanne (EPFL)Station 3CH‐1015LausanneSwitzerland
| | - Harald Brune
- Institute of Physics (IPHYS)École Polytechnique Fédérale de Lausanne (EPFL)Station 3CH‐1015LausanneSwitzerland
| | - Yanhua Lan
- Institute of Nanotechnology (INT)Karlsruhe Institute of Technology (KIT)Hermann‐von‐Helmholtz‐Platz 1D‐76344Eggenstein‐LeopoldshafenGermany
| | - Svetlana Klyatskaya
- Institute of Nanotechnology (INT)Karlsruhe Institute of Technology (KIT)Hermann‐von‐Helmholtz‐Platz 1D‐76344Eggenstein‐LeopoldshafenGermany
| | - Mario Ruben
- Institute of Nanotechnology (INT)Karlsruhe Institute of Technology (KIT)Hermann‐von‐Helmholtz‐Platz 1D‐76344Eggenstein‐LeopoldshafenGermany
- Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS)Centre National de la Recherche Scientifique (CNRS)Université de Strasbourg23 rue du Loess, BP 43F‐67034Strasbourg Cedex 2France
| | - Ari Paavo Seitsonen
- Département de ChimieÉcole Normale SupérieureF‐75005ParisFrance
- Centre National de la Recherche Scientifique (CNRS)Paris Sciences et LettresSorbonne UniversitéF‐75005ParisFrance
| | - Jan Dreiser
- Swiss Light SourcePaul Scherrer Institut (PSI)CH‐5232VilligenSwitzerland
- Institute of Physics (IPHYS)École Polytechnique Fédérale de Lausanne (EPFL)Station 3CH‐1015LausanneSwitzerland
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21
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Singha A, Donati F, Natterer FD, Wäckerlin C, Stavrić S, Popović ZS, Šljivančanin Ž, Patthey F, Brune H. Spin Excitations in a 4f-3d Heterodimer on MgO. Phys Rev Lett 2018; 121:257202. [PMID: 30608837 DOI: 10.1103/physrevlett.121.257202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2018] [Revised: 10/18/2018] [Indexed: 06/09/2023]
Abstract
We report on the magnetic properties of HoCo dimers as a model system for the smallest intermetallic compound of a lanthanide and a transition metal atom. The dimers are adsorbed on ultrathin MgO(100) films grown on Ag(100). New for 4f elements, we detect inelastic excitations with scanning tunneling spectroscopy and prove their magnetic origin by applying an external magnetic field. In combination with density functional theory and spin Hamiltonian analysis, we determine the magnetic level distribution, as well as sign and magnitude of the exchange interaction between the two atoms. In contrast to typical 4f-3d bulk compounds, we find ferromagnetic coupling in the dimer.
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Affiliation(s)
- A Singha
- Center for Quantum Nanoscience, Institute for Basic Science (IBS), Seoul 03760, Republic of Korea
- Institute of Physics, École Polytechnique Fédérale de Lausanne, Station 3, CH-1015 Lausanne, Switzerland
- Department of Physics, Ewha Womans University, Seoul 03760, Republic of Korea
| | - F Donati
- Center for Quantum Nanoscience, Institute for Basic Science (IBS), Seoul 03760, Republic of Korea
- Institute of Physics, École Polytechnique Fédérale de Lausanne, Station 3, CH-1015 Lausanne, Switzerland
- Department of Physics, Ewha Womans University, Seoul 03760, Republic of Korea
| | - F D Natterer
- Institute of Physics, École Polytechnique Fédérale de Lausanne, Station 3, CH-1015 Lausanne, Switzerland
- Physik-Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
| | - C Wäckerlin
- Institute of Physics, École Polytechnique Fédérale de Lausanne, Station 3, CH-1015 Lausanne, Switzerland
- Nanoscale Materials Science, Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland
| | - S Stavrić
- Vinča Institute of Nuclear Sciences, University of Belgrade, P.O. Box 522, RS-11001 Belgrade, Serbia
| | - Z S Popović
- Vinča Institute of Nuclear Sciences, University of Belgrade, P.O. Box 522, RS-11001 Belgrade, Serbia
| | - Ž Šljivančanin
- Vinča Institute of Nuclear Sciences, University of Belgrade, P.O. Box 522, RS-11001 Belgrade, Serbia
- Texas A&M University at Qatar, P.O. Box 23874, Education City, Doha, Qatar
| | - F Patthey
- Institute of Physics, École Polytechnique Fédérale de Lausanne, Station 3, CH-1015 Lausanne, Switzerland
| | - H Brune
- Institute of Physics, École Polytechnique Fédérale de Lausanne, Station 3, CH-1015 Lausanne, Switzerland
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22
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Natterer FD, Donati F, Patthey F, Brune H. Thermal and Magnetic-Field Stability of Holmium Single-Atom Magnets. Phys Rev Lett 2018; 121:027201. [PMID: 30085712 DOI: 10.1103/physrevlett.121.027201] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/01/2018] [Revised: 04/13/2018] [Indexed: 06/08/2023]
Abstract
We use spin-polarized scanning tunneling microscopy to demonstrate that Ho atoms on magnesium oxide exhibit a coercive field of more than 8 T and magnetic bistability for many minutes, both at 35 K. The first spontaneous magnetization reversal events are recorded at 45 K, for which the metastable state relaxes in an external field of 8 T. The transverse magnetic anisotropy energy is estimated from magnetic field and bias voltage dependent switching rates at 4.3 K. Our measurements constrain the possible ground state of Ho single-atom magnets to either J_{z}=7 or 8, both compatible with magnetic bistability at fields larger than 10 mT.
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Affiliation(s)
- Fabian Donat Natterer
- Institute of Physics, École Polytechnique Fédérale de Lausanne, Station 3, CH-1015 Lausanne, Switzerland
| | - Fabio Donati
- Institute of Physics, École Polytechnique Fédérale de Lausanne, Station 3, CH-1015 Lausanne, Switzerland
- Center for Quantum Nanoscience, Institute for Basic Science, Seoul 03760, Republic of Korea
- Department of Physics, Ewha Womans University, Seoul 03760, Republic of Korea
| | - François Patthey
- Institute of Physics, École Polytechnique Fédérale de Lausanne, Station 3, CH-1015 Lausanne, Switzerland
| | - Harald Brune
- Institute of Physics, École Polytechnique Fédérale de Lausanne, Station 3, CH-1015 Lausanne, Switzerland
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23
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Vivaldi C, Cappelli C, Donati F, Fornaro L, Musettini G, Pasquini G, Pecora I, Catanese S, Lencioni M, Salani F, Boraschi P, Falcone A, Vasile E. Analysis of early tumor shrinkage and depth of response in metastatic pancreatic cancer patients treated with first-line modified FOLFIRINOX or gemcitabine + nab-paclitaxel. Ann Oncol 2018. [DOI: 10.1093/annonc/mdy151.158] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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24
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Buligan C, Donati F, Stinco G. Prediction of 30-year cardiovascular disease risk in psoriatic population. J Eur Acad Dermatol Venereol 2017; 31:e516-e517. [DOI: 10.1111/jdv.14367] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- C. Buligan
- Department of Medical Area; Institute of Dermatology; University of Udine; 33100 Udine Italy
| | - F. Donati
- Department of Medical Area; Institute of Dermatology; University of Udine; 33100 Udine Italy
| | - G. Stinco
- Department of Medical Area; Institute of Dermatology; University of Udine; 33100 Udine Italy
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25
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Pacchioni GE, Pivetta M, Gragnaniello L, Donati F, Autès G, Yazyev OV, Rusponi S, Brune H. Two-Orbital Kondo Screening in a Self-Assembled Metal-Organic Complex. ACS Nano 2017; 11:2675-2681. [PMID: 28234448 DOI: 10.1021/acsnano.6b07431] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Iron atoms adsorbed on a Cu(111) surface and buried under polyphenyl dicarbonitrile molecules exhibit strongly spatial anisotropic Kondo features with directionally dependent Kondo temperatures and line shapes, as evidenced by scanning tunneling spectroscopy. First-principles calculations find nearly full polarization for the half-filled Fe 3dxz and 3dyz orbitals, which therefore can give rise to Kondo screening with the experimentally observed directional dependence and distinct Kondo temperatures. X-ray absorption spectroscopy and X-ray magnetic circular dichroism measurements confirm that the spin in both channels is effectively Kondo-screened. At ideal Fe coverage, these two-orbital Kondo impurities are arranged in a self-assembled honeycomb superlattice.
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Affiliation(s)
- Giulia E Pacchioni
- Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL) , CH-1015 Lausanne, Switzerland
| | - Marina Pivetta
- Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL) , CH-1015 Lausanne, Switzerland
| | - Luca Gragnaniello
- Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL) , CH-1015 Lausanne, Switzerland
| | - Fabio Donati
- Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL) , CH-1015 Lausanne, Switzerland
| | - Gabriel Autès
- Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL) , CH-1015 Lausanne, Switzerland
| | - Oleg V Yazyev
- Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL) , CH-1015 Lausanne, Switzerland
| | - Stefano Rusponi
- Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL) , CH-1015 Lausanne, Switzerland
| | - Harald Brune
- Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL) , CH-1015 Lausanne, Switzerland
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26
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Baltic R, Pivetta M, Donati F, Wäckerlin C, Singha A, Dreiser J, Rusponi S, Brune H. Superlattice of Single Atom Magnets on Graphene. Nano Lett 2016; 16:7610-7615. [PMID: 27779891 DOI: 10.1021/acs.nanolett.6b03543] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Regular arrays of single atoms with stable magnetization represent the ultimate limit of ultrahigh density storage media. Here we report a self-assembled superlattice of individual and noninteracting Dy atoms on graphene grown on Ir(111), with magnetic hysteresis up to 5.6 T and spin lifetime of 1000 s at 2.5 K. The observed magnetic stability is a consequence of the intrinsic low electron and phonon densities of graphene and the 6-fold symmetry of the adsorption site. Our array of single atom magnets has a density of 115 Tbit/inch2, defined by the periodicity of the graphene moiré pattern.
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Affiliation(s)
- Romana Baltic
- Institute of Physics, Ecole Polytechnique Fédérale de Lausanne , Station 3, CH-1015 Lausanne, Switzerland
| | - Marina Pivetta
- Institute of Physics, Ecole Polytechnique Fédérale de Lausanne , Station 3, CH-1015 Lausanne, Switzerland
| | - Fabio Donati
- Institute of Physics, Ecole Polytechnique Fédérale de Lausanne , Station 3, CH-1015 Lausanne, Switzerland
| | - Christian Wäckerlin
- Institute of Physics, Ecole Polytechnique Fédérale de Lausanne , Station 3, CH-1015 Lausanne, Switzerland
| | - Aparajita Singha
- Institute of Physics, Ecole Polytechnique Fédérale de Lausanne , Station 3, CH-1015 Lausanne, Switzerland
| | - Jan Dreiser
- Institute of Physics, Ecole Polytechnique Fédérale de Lausanne , Station 3, CH-1015 Lausanne, Switzerland
- Swiss Light Source, Paul Scherrer Institute , CH-5232 Villigen PSI, Switzerland
| | - Stefano Rusponi
- Institute of Physics, Ecole Polytechnique Fédérale de Lausanne , Station 3, CH-1015 Lausanne, Switzerland
| | - Harald Brune
- Institute of Physics, Ecole Polytechnique Fédérale de Lausanne , Station 3, CH-1015 Lausanne, Switzerland
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27
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Perisano C, Rosa MA, Donati F, Barone C, Maccauro G. Treatment options of simple bone cysts: the role of bone substitutes, growth factors and literature review. J BIOL REG HOMEOS AG 2016; 30:159-164. [PMID: 28002914] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The solitary bone cyst is a typical tumor-like lesion of the immature skeleton, whose etio-pathogenesis is still unclear. The purpose of this work is to perform a review of the literature about the different surgical approaches focusing on the role of bone substitutes and growth factors. Literature analysis shows injection techniques of substances such as methylprednisolone, autologous bone marrow, demineralized bone matrix, calcium sulphate and surgical techniques that involve the resection and curettage associated with bone graft and/or intramedullary nailing. Although there are good results currently associated to these techniques and the different ways of treatment, the only evidence-based treatment is given by injections of steroids. However, given the high rate of failure, autologous bone marrow and platelet gel represent a viable therapeutic option.
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Affiliation(s)
- C Perisano
- Department of Geriatrics, Neuroscience and Orthopaedics, University Hospital Agostino Gemelli, Catholic University of the Sacred Heart School of Medicine, Rome, Italy
| | - M A Rosa
- Division of Orthopaedics and Traumatology, Department of Biomedical Sciences and Morphological and Functional Images, School of Orthopaedics and Traumatology, University of Messina, Italy
| | - F Donati
- Department of Geriatrics, Neuroscience and Orthopaedics, University Hospital Agostino Gemelli, Catholic University of the Sacred Heart School of Medicine, Rome, Italy
| | - C Barone
- Department of Internal Medicine, Division of Medical Oncology, University Hospital Agostino Gemelli, Catholic University of the Sacred Heart School of Medicine, Rome, Italy
| | - G Maccauro
- Department of Geriatrics, Neuroscience and Orthopaedics, University Hospital Agostino Gemelli, Catholic University of the Sacred Heart School of Medicine, Rome, Italy
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28
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Wäckerlin C, Donati F, Singha A, Baltic R, Rusponi S, Diller K, Patthey F, Pivetta M, Lan Y, Klyatskaya S, Ruben M, Brune H, Dreiser J. Single-Molecule Magnets: Giant Hysteresis of Single-Molecule Magnets Adsorbed on a Nonmagnetic Insulator (Adv. Mater. 26/2016). Adv Mater 2016; 28:5142. [PMID: 27383020 DOI: 10.1002/adma.201670180] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
In Tb(Pc)2 single-molecule magnets, where Pc is phthalocyanine, adsorbed on magnesium oxide, the fluctuations of the terbium magnetic moment are strongly suppressed in contrast to the adsorption on silver. On page 5195, J. Dreiser and co-workers investigate that the molecules are perfectly organized by self-assembly, as seen in the scanning tunnelling microscopy image (top part of the design). The molecules are probed by circularly polarized X-rays depicted as green spirals.
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Affiliation(s)
- Christian Wäckerlin
- Institute of Physics (IPHYS), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015, Lausanne, Switzerland
| | - Fabio Donati
- Institute of Physics (IPHYS), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015, Lausanne, Switzerland
| | - Aparajita Singha
- Institute of Physics (IPHYS), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015, Lausanne, Switzerland
| | - Romana Baltic
- Institute of Physics (IPHYS), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015, Lausanne, Switzerland
| | - Stefano Rusponi
- Institute of Physics (IPHYS), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015, Lausanne, Switzerland
| | - Katharina Diller
- Institute of Physics (IPHYS), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015, Lausanne, Switzerland
| | - François Patthey
- Institute of Physics (IPHYS), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015, Lausanne, Switzerland
| | - Marina Pivetta
- Institute of Physics (IPHYS), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015, Lausanne, Switzerland
| | - Yanhua Lan
- Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), D-76344, Eggenstein-Leopoldshafen, Germany
| | - Svetlana Klyatskaya
- Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), D-76344, Eggenstein-Leopoldshafen, Germany
| | - Mario Ruben
- Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), D-76344, Eggenstein-Leopoldshafen, Germany
- Institut de Physique et Chimie des Matériaux (IPCMS), Université de Strasbourg, F-67034, Strasbourg, France
| | - Harald Brune
- Institute of Physics (IPHYS), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015, Lausanne, Switzerland
| | - Jan Dreiser
- Institute of Physics (IPHYS), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015, Lausanne, Switzerland
- Swiss Light Source, Paul Scherrer Institut (PSI), CH-5232, Villigen, Switzerland
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29
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Wäckerlin C, Donati F, Singha A, Baltic R, Rusponi S, Diller K, Patthey F, Pivetta M, Lan Y, Klyatskaya S, Ruben M, Brune H, Dreiser J. Giant Hysteresis of Single-Molecule Magnets Adsorbed on a Nonmagnetic Insulator. Adv Mater 2016; 28:5195-5199. [PMID: 27159732 DOI: 10.1002/adma.201506305] [Citation(s) in RCA: 89] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2015] [Revised: 04/02/2016] [Indexed: 06/05/2023]
Abstract
TbPc2 single-molecule magnets adsorbed on a magnesium oxide tunnel barrier exhibit record magnetic remanence, record hysteresis opening, perfect out-of-plane alignment of the magnetic easy axes, and self-assembly into a well-ordered layer.
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Affiliation(s)
- Christian Wäckerlin
- Institute of Physics (IPHYS), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015, Lausanne, Switzerland
| | - Fabio Donati
- Institute of Physics (IPHYS), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015, Lausanne, Switzerland
| | - Aparajita Singha
- Institute of Physics (IPHYS), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015, Lausanne, Switzerland
| | - Romana Baltic
- Institute of Physics (IPHYS), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015, Lausanne, Switzerland
| | - Stefano Rusponi
- Institute of Physics (IPHYS), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015, Lausanne, Switzerland
| | - Katharina Diller
- Institute of Physics (IPHYS), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015, Lausanne, Switzerland
| | - François Patthey
- Institute of Physics (IPHYS), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015, Lausanne, Switzerland
| | - Marina Pivetta
- Institute of Physics (IPHYS), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015, Lausanne, Switzerland
| | - Yanhua Lan
- Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), D-76344, Eggenstein-Leopoldshafen, Germany
| | - Svetlana Klyatskaya
- Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), D-76344, Eggenstein-Leopoldshafen, Germany
| | - Mario Ruben
- Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), D-76344, Eggenstein-Leopoldshafen, Germany
- Institut de Physique et Chimie des Matériaux (IPCMS), Université de Strasbourg, F-67034, Strasbourg, France
| | - Harald Brune
- Institute of Physics (IPHYS), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015, Lausanne, Switzerland
| | - Jan Dreiser
- Institute of Physics (IPHYS), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015, Lausanne, Switzerland
- Swiss Light Source, Paul Scherrer Institut (PSI), CH-5232, Villigen, Switzerland
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Abstract
We report magnetic hysteresis in Er clusters on Cu(111) starting from the size of three atoms. Combining X-ray magnetic circular dichroism, scanning tunneling microscopy, and mean-field nucleation theory, we determine the size-dependent magnetic properties of the Er clusters. Er atoms and dimers are paramagnetic, and their easy magnetization axes are oriented in-plane. In contrast, trimers and bigger clusters exhibit magnetic hysteresis at 2.5 K with a relaxation time of 2 min at 0.1 T and out-of-plane easy axis. This appearance of magnetic stability for trimers coincides with their enhanced structural stability.
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Affiliation(s)
- Aparajita Singha
- Institute of Physics, École Polytechnique Fédérale de Lausanne , Station 3, CH-1015 Lausanne, Switzerland
| | - Fabio Donati
- Institute of Physics, École Polytechnique Fédérale de Lausanne , Station 3, CH-1015 Lausanne, Switzerland
| | - Christian Wäckerlin
- Institute of Physics, École Polytechnique Fédérale de Lausanne , Station 3, CH-1015 Lausanne, Switzerland
| | - Romana Baltic
- Institute of Physics, École Polytechnique Fédérale de Lausanne , Station 3, CH-1015 Lausanne, Switzerland
| | - Jan Dreiser
- Institute of Physics, École Polytechnique Fédérale de Lausanne , Station 3, CH-1015 Lausanne, Switzerland
- Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - Marina Pivetta
- Institute of Physics, École Polytechnique Fédérale de Lausanne , Station 3, CH-1015 Lausanne, Switzerland
| | - Stefano Rusponi
- Institute of Physics, École Polytechnique Fédérale de Lausanne , Station 3, CH-1015 Lausanne, Switzerland
| | - Harald Brune
- Institute of Physics, École Polytechnique Fédérale de Lausanne , Station 3, CH-1015 Lausanne, Switzerland
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31
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Donati F, Rusponi S, Stepanow S, Wäckerlin C, Singha A, Persichetti L, Baltic R, Diller K, Patthey F, Fernandes E, Dreiser J, Šljivančanin Ž, Kummer K, Nistor C, Gambardella P, Brune H. Magnetic remanence in single atoms. Science 2016; 352:318-21. [PMID: 27081065 DOI: 10.1126/science.aad9898] [Citation(s) in RCA: 208] [Impact Index Per Article: 26.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2015] [Accepted: 03/08/2016] [Indexed: 11/02/2022]
Abstract
A permanent magnet retains a substantial fraction of its saturation magnetization in the absence of an external magnetic field. Realizing magnetic remanence in a single atom allows for storing and processing information in the smallest unit of matter. We show that individual holmium (Ho) atoms adsorbed on ultrathin MgO(100) layers on Ag(100) exhibit magnetic remanence up to a temperature of 30 kelvin and a relaxation time of 1500 seconds at 10 kelvin. This extraordinary stability is achieved by the realization of a symmetry-protected magnetic ground state and by decoupling the Ho spin from the underlying metal by a tunnel barrier.
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Affiliation(s)
- F Donati
- Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | - S Rusponi
- Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | - S Stepanow
- Department of Materials, ETH Zürich, Hönggerbergring 64, CH-8093 Zürich, Switzerland
| | - C Wäckerlin
- Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | - A Singha
- Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | - L Persichetti
- Department of Materials, ETH Zürich, Hönggerbergring 64, CH-8093 Zürich, Switzerland
| | - R Baltic
- Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | - K Diller
- Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | - F Patthey
- Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | - E Fernandes
- Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | - J Dreiser
- Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland. Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - Ž Šljivančanin
- Vinča Institute of Nuclear Sciences (020), Post Office Box 522, 11001 Belgrade, Serbia. Texas A&M University at Qatar, Doha, Qatar
| | - K Kummer
- European Synchrotron Radiation Facility (ESRF), F-38043 Grenoble, France
| | - C Nistor
- Department of Materials, ETH Zürich, Hönggerbergring 64, CH-8093 Zürich, Switzerland
| | - P Gambardella
- Department of Materials, ETH Zürich, Hönggerbergring 64, CH-8093 Zürich, Switzerland.
| | - H Brune
- Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland.
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Dreiser J, Pacchioni GE, Donati F, Gragnaniello L, Cavallin A, Pedersen KS, Bendix J, Delley B, Pivetta M, Rusponi S, Brune H. Out-of-Plane Alignment of Er(trensal) Easy Magnetization Axes Using Graphene. ACS Nano 2016; 10:2887-2892. [PMID: 26814851 DOI: 10.1021/acsnano.5b08178] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We have studied Er(trensal) single-ion magnets adsorbed on graphene/Ru(0001), on graphene/Ir(111), and on bare Ru(0001) by scanning tunneling microscopy and X-ray absorption spectroscopy. On graphene, the molecules self-assemble into dense and well-ordered islands with their magnetic easy axes perpendicular to the surface. In contrast, on bare Ru(0001), the molecules are disordered, exhibiting only weak directional preference of the easy magnetization axis. The perfect out-of-plane alignment of the easy axes on graphene results from the molecule-molecule interaction, which dominates over the weak adsorption on the graphene surface. Our results demonstrate that the net magnetic properties of a molecular submonolayer can be tuned using a graphene spacer layer, which is attractive for hybrid molecule-inorganic spintronic devices.
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Affiliation(s)
- Jan Dreiser
- Institute of Physics, Ecole Polytechnique Fédérale de Lausanne , 1015 Lausanne, Switzerland
| | - Giulia E Pacchioni
- Institute of Physics, Ecole Polytechnique Fédérale de Lausanne , 1015 Lausanne, Switzerland
| | - Fabio Donati
- Institute of Physics, Ecole Polytechnique Fédérale de Lausanne , 1015 Lausanne, Switzerland
| | - Luca Gragnaniello
- Institute of Physics, Ecole Polytechnique Fédérale de Lausanne , 1015 Lausanne, Switzerland
| | - Alberto Cavallin
- Institute of Physics, Ecole Polytechnique Fédérale de Lausanne , 1015 Lausanne, Switzerland
| | - Kasper S Pedersen
- CNRS, CRPP, UPR 8641 and CNRS, ICMCB, UPR 9014, 33600 Pessac, France
| | - Jesper Bendix
- Department of Chemistry, University of Copenhagen , 2100 Copenhagen, Denmark
| | | | - Marina Pivetta
- Institute of Physics, Ecole Polytechnique Fédérale de Lausanne , 1015 Lausanne, Switzerland
| | - Stefano Rusponi
- Institute of Physics, Ecole Polytechnique Fédérale de Lausanne , 1015 Lausanne, Switzerland
| | - Harald Brune
- Institute of Physics, Ecole Polytechnique Fédérale de Lausanne , 1015 Lausanne, Switzerland
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Barla A, Bellini V, Rusponi S, Ferriani P, Pivetta M, Donati F, Patthey F, Persichetti L, Mahatha SK, Papagno M, Piamonteze C, Fichtner S, Heinze S, Gambardella P, Brune H, Carbone C. Complex Magnetic Exchange Coupling between Co Nanostructures and Ni(111) across Epitaxial Graphene. ACS Nano 2016; 10:1101-1107. [PMID: 26588469 DOI: 10.1021/acsnano.5b06410] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We report on the magnetic coupling between isolated Co atoms as well as small Co islands and Ni(111) mediated by an epitaxial graphene layer. X-ray magnetic circular dichroism and scanning tunneling microscopy combined with density functional theory calculations reveal that Co atoms occupy two distinct adsorption sites, with different magnetic coupling to the underlying Ni(111) surface. We further report a transition from an antiferromagnetic to a ferromagnetic coupling with increasing Co cluster size. Our results highlight the extreme sensitivity of the exchange interaction mediated by graphene to the adsorption site and to the in-plane coordination of the magnetic atoms.
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Affiliation(s)
- Alessandro Barla
- Istituto di Struttura della Materia (ISM), Consiglio Nazionale delle Ricerche (CNR) , I-34149 Trieste, Italy
| | - Valerio Bellini
- S3-Istituto di Nanoscienze-CNR , Via Campi 213/A, I-41125 Modena, Italy
| | - Stefano Rusponi
- Institute of Condensed Matter Physics (ICMP), Ecole Polytechnique Fédérale de Lausanne (EPFL) , Station 3, CH-1015 Lausanne, Switzerland
| | - Paolo Ferriani
- Institute of Theoretical Physics and Astrophysics, University of Kiel , D-24098 Kiel, Germany
| | - Marina Pivetta
- Institute of Condensed Matter Physics (ICMP), Ecole Polytechnique Fédérale de Lausanne (EPFL) , Station 3, CH-1015 Lausanne, Switzerland
| | - Fabio Donati
- Institute of Condensed Matter Physics (ICMP), Ecole Polytechnique Fédérale de Lausanne (EPFL) , Station 3, CH-1015 Lausanne, Switzerland
| | - François Patthey
- Institute of Condensed Matter Physics (ICMP), Ecole Polytechnique Fédérale de Lausanne (EPFL) , Station 3, CH-1015 Lausanne, Switzerland
| | - Luca Persichetti
- Department of Materials, ETH Zurich , CH-8093 Zurich, Switzerland
| | - Sanjoy K Mahatha
- Istituto di Struttura della Materia (ISM), Consiglio Nazionale delle Ricerche (CNR) , I-34149 Trieste, Italy
| | - Marco Papagno
- Dipartimento di Fisica, Università della Calabria , I-87036 Arcavacata di Rende (Cs), Italy
| | - Cinthia Piamonteze
- Swiss Light Source, Paul Scherrer Institut , CH-5232 Villigen PSI, Switzerland
| | - Simon Fichtner
- Institute of Theoretical Physics and Astrophysics, University of Kiel , D-24098 Kiel, Germany
| | - Stefan Heinze
- Institute of Theoretical Physics and Astrophysics, University of Kiel , D-24098 Kiel, Germany
| | | | - Harald Brune
- Institute of Condensed Matter Physics (ICMP), Ecole Polytechnique Fédérale de Lausanne (EPFL) , Station 3, CH-1015 Lausanne, Switzerland
| | - Carlo Carbone
- Istituto di Struttura della Materia (ISM), Consiglio Nazionale delle Ricerche (CNR) , I-34149 Trieste, Italy
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Baumann S, Donati F, Stepanow S, Rusponi S, Paul W, Gangopadhyay S, Rau IG, Pacchioni GE, Gragnaniello L, Pivetta M, Dreiser J, Piamonteze C, Lutz CP, Macfarlane RM, Jones BA, Gambardella P, Heinrich AJ, Brune H. Origin of Perpendicular Magnetic Anisotropy and Large Orbital Moment in Fe Atoms on MgO. Phys Rev Lett 2015; 115:237202. [PMID: 26684139 DOI: 10.1103/physrevlett.115.237202] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2015] [Indexed: 06/05/2023]
Abstract
We report on the magnetic properties of individual Fe atoms deposited on MgO(100) thin films probed by x-ray magnetic circular dichroism and scanning tunneling spectroscopy. We show that the Fe atoms have strong perpendicular magnetic anisotropy with a zero-field splitting of 14.0±0.3 meV/atom. This is a factor of 10 larger than the interface anisotropy of epitaxial Fe layers on MgO and the largest value reported for Fe atoms adsorbed on surfaces. The interplay between the ligand field at the O adsorption sites and spin-orbit coupling is analyzed by density functional theory and multiplet calculations, providing a comprehensive model of the magnetic properties of Fe atoms in a low-symmetry bonding environment.
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Affiliation(s)
- S Baumann
- IBM Almaden Research Center, 650 Harry Road, San Jose, California 95120, USA
- Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland
| | - F Donati
- Institute of Condensed Matter Physics, École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | - S Stepanow
- Department of Materials, ETH Zürich, Hönggerbergring 64, CH-8093 Zürich, Switzerland
| | - S Rusponi
- Institute of Condensed Matter Physics, École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | - W Paul
- IBM Almaden Research Center, 650 Harry Road, San Jose, California 95120, USA
| | - S Gangopadhyay
- IBM Almaden Research Center, 650 Harry Road, San Jose, California 95120, USA
- Department of Physics, University of California, Davis, California 95616, USA
| | - I G Rau
- IBM Almaden Research Center, 650 Harry Road, San Jose, California 95120, USA
| | - G E Pacchioni
- Institute of Condensed Matter Physics, École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | - L Gragnaniello
- Institute of Condensed Matter Physics, École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | - M Pivetta
- Institute of Condensed Matter Physics, École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | - J Dreiser
- Institute of Condensed Matter Physics, École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
- Swiss Light Source (SLS), Paul Scherrer Institute (PSI), CH-5232 Villigen PSI, Switzerland
| | - C Piamonteze
- Swiss Light Source (SLS), Paul Scherrer Institute (PSI), CH-5232 Villigen PSI, Switzerland
| | - C P Lutz
- IBM Almaden Research Center, 650 Harry Road, San Jose, California 95120, USA
| | - R M Macfarlane
- IBM Almaden Research Center, 650 Harry Road, San Jose, California 95120, USA
| | - B A Jones
- IBM Almaden Research Center, 650 Harry Road, San Jose, California 95120, USA
| | - P Gambardella
- Department of Materials, ETH Zürich, Hönggerbergring 64, CH-8093 Zürich, Switzerland
| | - A J Heinrich
- IBM Almaden Research Center, 650 Harry Road, San Jose, California 95120, USA
| | - H Brune
- Institute of Condensed Matter Physics, École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
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Donati F, Di Giacomo G, Ziranu A, Spinelli S, Perisano C, Rosa MA, Maccauro G. SILVER COATED PROSTHESIS IN ONCOLOGICAL LIMB SALVAGE SURGERY REDUCE THE INFECTION RATE. J BIOL REG HOMEOS AG 2015; 29:149-155. [PMID: 26652484] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Silver coatings, used in many surgical devices, have demonstrated good antimicrobial activity and low toxicity. Oncological musculoskeletal surgery have a high risk of infection, so in the last decades, silver-coated mega-prostheses have been introduced and are becoming increasingly widespread. In this study, a retrospective analysis of 158 cases of bone tumors, primary or metastatic, treated between 2005- 2015 with wide margins resection and tumor implants reconstruction, was performed. The average age was 59 years (range 11-78 years), the same surgeon with antibiotic prophylaxis according to a standard protocol treated all patients. Silver-coated prostheses were implanted in 58.5% of patients and uncoated tumor prostheses in the remaining 41.5%. Patients were re-evaluated annually and complications were recorded, focusing analysis on infective complications. The average follow-up was 39.7 months: 23.4% of patients died at a median time of 35.3 months after surgery; 18.4% developed complications that required new surgery, of which 12.6% of these were due to infection. Patients treated with silver-coated implants developed early infection in 2.2% of cases against the 10.7% of the patients treated with standard tumor prosthesis. This difference between the two groups was statistically significant. The percentage of late infections occurring from 6 months after surgery was similar in both groups. Silver blood level taken in a sample of patients at different times after surgery, always showed values well below the threshold of toxicity and no patient showed any sign of local or general toxicity secondary to silver. Our study demonstrates that tumor silver-coated implants have a rate of early infection significantly lower than traditional implants, while there were no differences in the rate of late infections as described also in the literature. We recommend the use of silvercoated prosthesis as primary implants for limb salvage surgery in primary or metastatic bone tumors, considering the absence of toxicity and the lower rate of early infection.
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Affiliation(s)
- F Donati
- Catholic University of the Sacred Heart, Division of Orthopedic and Traumatology, Rome, Italy
| | - G Di Giacomo
- Catholic University of the Sacred Heart, Division of Orthopedic and Traumatology, Rome, Italy
| | - A Ziranu
- Catholic University of the Sacred Heart, Division of Orthopedic and Traumatology, Rome, Italy
| | - S Spinelli
- Catholic University of the Sacred Heart, Division of Orthopedic and Traumatology, Rome, Italy
| | - C Perisano
- Catholic University of the Sacred Heart, Division of Orthopedic and Traumatology, Rome, Italy
| | - M A Rosa
- Messina University, Division of Orthopedic and Traumatology, Messina, Italy
| | - G Maccauro
- Catholic University of the Sacred Heart, Division of Orthopedic and Traumatology, Rome, Italy
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Caforio L, Pagnotta G, Romiti A, Familiari A, Donati F, Bagolan P. Prenatal diagnosis of Gollop-Wolfgang complex. Ultrasound Obstet Gynecol 2015; 45:488-490. [PMID: 25302853 DOI: 10.1002/uog.14686] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2014] [Revised: 09/14/2014] [Accepted: 09/24/2014] [Indexed: 06/04/2023]
Affiliation(s)
- L Caforio
- Department of Medical and Surgical Neonatology, Bambino Gesù Children's Hospital, Rome, Italy
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Dubout Q, Donati F, Wäckerlin C, Calleja F, Etzkorn M, Lehnert A, Claude L, Gambardella P, Brune H. Controlling the spin of co atoms on pt(111) by hydrogen adsorption. Phys Rev Lett 2015; 114:106807. [PMID: 25815958 DOI: 10.1103/physrevlett.114.106807] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2014] [Indexed: 06/04/2023]
Abstract
We investigate the effect of H adsorption on the magnetic properties of individual Co atoms on Pt(111) with scanning tunneling microscopy. For pristine Co atoms, we detect no inelastic features in the tunnel spectra. Conversely, CoH and CoH2 show a number of low-energy vibrational features in their differential conductance identified by isotope substitution. Only the fcc-adsorbed species present conductance steps of magnetic origin, with a field splitting identifying their effective spin as Seff=2 for CoH and 3/2 for CoH2. The exposure to H2 and desorption through tunnel electrons allow the reversible control of the spin in half-integer steps. Because of the presence of the surface, the hydrogen-induced spin increase is opposite to the spin sequence of CoHn molecules in the gas phase.
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Affiliation(s)
- Q Dubout
- Institute of Condensed Matter Physics (ICMP), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | - F Donati
- Institute of Condensed Matter Physics (ICMP), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | - C Wäckerlin
- Institute of Condensed Matter Physics (ICMP), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | - F Calleja
- Institute of Condensed Matter Physics (ICMP), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
- Madrid Institute for Advanced Studies, IMDEA Nanoscience, Calle Faraday 9, Campus Cantoblanco, E-28049 Madrid, Spain
| | - M Etzkorn
- Institute of Condensed Matter Physics (ICMP), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
- Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart, Germany
| | - A Lehnert
- Institute of Condensed Matter Physics (ICMP), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | - L Claude
- Institute of Condensed Matter Physics (ICMP), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | - P Gambardella
- Institute of Condensed Matter Physics (ICMP), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
- Department of Materials, ETH Zürich, Hönggerbergring 64, CH-8093 Zürich, Switzerland
| | - H Brune
- Institute of Condensed Matter Physics (ICMP), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
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Wäckerlin C, Donati F, Singha A, Baltic R, Uldry AC, Delley B, Rusponi S, Dreiser J. Strong antiferromagnetic exchange between manganese phthalocyanine and ferromagnetic europium oxide. Chem Commun (Camb) 2015; 51:12958-61. [DOI: 10.1039/c5cc01823d] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
A record strong antiferromagnetic exchange interaction between an organic magnetic semiconductor and an insulating ferromagnetic oxide is observed.
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Affiliation(s)
- Christian Wäckerlin
- Institute of Condensed Matter Physics
- Ecole Polytechnique Fédérale de Lausanne
- CH-1015 Lausanne
- Switzerland
| | - Fabio Donati
- Institute of Condensed Matter Physics
- Ecole Polytechnique Fédérale de Lausanne
- CH-1015 Lausanne
- Switzerland
| | - Aparajita Singha
- Institute of Condensed Matter Physics
- Ecole Polytechnique Fédérale de Lausanne
- CH-1015 Lausanne
- Switzerland
| | - Romana Baltic
- Institute of Condensed Matter Physics
- Ecole Polytechnique Fédérale de Lausanne
- CH-1015 Lausanne
- Switzerland
| | | | - Bernard Delley
- Condensed Matter Theory
- Paul Scherrer Institut
- CH-5232 Villigen
- Switzerland
| | - Stefano Rusponi
- Institute of Condensed Matter Physics
- Ecole Polytechnique Fédérale de Lausanne
- CH-1015 Lausanne
- Switzerland
| | - Jan Dreiser
- Institute of Condensed Matter Physics
- Ecole Polytechnique Fédérale de Lausanne
- CH-1015 Lausanne
- Switzerland
- Swiss Light Source
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Donati F, Singha A, Stepanow S, Wäckerlin C, Dreiser J, Gambardella P, Rusponi S, Brune H. Magnetism of Ho and Er atoms on close-packed metal surfaces. Phys Rev Lett 2014; 113:237201. [PMID: 25526151 DOI: 10.1103/physrevlett.113.237201] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2014] [Indexed: 06/04/2023]
Abstract
We investigated the magnetic properties of individual Ho atoms adsorbed on the (111) surface of Pt, which have been recently claimed to display single ion magnetic behavior. By combining x-ray absorption spectroscopy and magnetic dichroism measurements with ligand field multiplet calculations, we reveal a ground state which is incompatible with long spin relaxation times, in disagreement with former findings. A comparative study of the ground state and magnetic anisotropy of Ho and Er on Pt(111) and Cu(111) emphasizes the different interaction of the 4f orbitals with localized and delocalized substrate states. In particular, we find a striking rotation of the magnetization easy axis for Er, which changes from out of plane on Pt(111) to in plane on Cu(111).
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Affiliation(s)
- F Donati
- Institute of Condensed Matter Physics (ICMP), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | - A Singha
- Institute of Condensed Matter Physics (ICMP), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | - S Stepanow
- Department of Materials, ETH Zürich, Hönggerbergring 64, CH-8093 Zürich, Switzerland
| | - C Wäckerlin
- Institute of Condensed Matter Physics (ICMP), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | - J Dreiser
- Institute of Condensed Matter Physics (ICMP), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland and Swiss Light Source (SLS), Paul Scherrer Institute (PSI)CH-5232 Villigen PSI, Switzerland
| | - P Gambardella
- Department of Materials, ETH Zürich, Hönggerbergring 64, CH-8093 Zürich, Switzerland
| | - S Rusponi
- Institute of Condensed Matter Physics (ICMP), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | - H Brune
- Institute of Condensed Matter Physics (ICMP), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
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Donati F, Gragnaniello L, Cavallin A, Natterer FD, Dubout Q, Pivetta M, Patthey F, Dreiser J, Piamonteze C, Rusponi S, Brune H. Tailoring the magnetism of Co atoms on graphene through substrate hybridization. Phys Rev Lett 2014; 113:177201. [PMID: 25379935 DOI: 10.1103/physrevlett.113.177201] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2014] [Indexed: 06/04/2023]
Abstract
We determine the magnetic properties of individual Co atoms adsorbed on graphene (G) with x-ray absorption spectroscopy and magnetic circular dichroism. The magnetic ground state of Co adatoms strongly depends on the choice of the metal substrate on which graphene is grown. Cobalt atoms on G/Ru(0001) feature exceptionally large orbital and spin moments, as well as an out-of-plane easy axis with large magnetic anisotropy. Conversely, the magnetic moments are strongly reduced for Co/G/Ir(111), and the magnetization is of the easy-plane type. We demonstrate how the Co magnetic properties, which ultimately depend on the degree of hybridization between the Co 3d orbitals and graphene π bands, can be tailored through the strength of the graphene-substrate coupling.
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Affiliation(s)
- F Donati
- Institute of Condensed Matter Physics (ICMP), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | - L Gragnaniello
- Institute of Condensed Matter Physics (ICMP), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | - A Cavallin
- Institute of Condensed Matter Physics (ICMP), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | - F D Natterer
- Institute of Condensed Matter Physics (ICMP), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | - Q Dubout
- Institute of Condensed Matter Physics (ICMP), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | - M Pivetta
- Institute of Condensed Matter Physics (ICMP), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | - F Patthey
- Institute of Condensed Matter Physics (ICMP), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | - J Dreiser
- Institute of Condensed Matter Physics (ICMP), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland and Swiss Light Source (SLS), Paul Scherrer Institut (PSI), CH-5232 Villigen PSI, Switzerland
| | - C Piamonteze
- Swiss Light Source (SLS), Paul Scherrer Institut (PSI), CH-5232 Villigen PSI, Switzerland
| | - S Rusponi
- Institute of Condensed Matter Physics (ICMP), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | - H Brune
- Institute of Condensed Matter Physics (ICMP), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
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Dreiser J, Wäckerlin C, Ali ME, Piamonteze C, Donati F, Singha A, Pedersen KS, Rusponi S, Bendix J, Oppeneer PM, Jung TA, Brune H. Exchange interaction of strongly anisotropic tripodal erbium single-ion magnets with metallic surfaces. ACS Nano 2014; 8:4662-4671. [PMID: 24645922 DOI: 10.1021/nn500409u] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We present a comprehensive study of Er(trensal) single-ion magnets deposited in ultrahigh vacuum onto metallic surfaces. X-ray photoelectron spectroscopy reveals that the molecular structure is preserved after sublimation, and that the molecules are physisorbed on Au(111) while they are chemisorbed on a Ni thin film on Cu(100) single-crystalline surfaces. X-ray magnetic circular dichroism (XMCD) measurements performed on Au(111) samples covered with molecular monolayers held at temperatures down to 4 K suggest that the easy axes of the strongly anisotropic molecules are randomly oriented. Furthermore XMCD indicates a weak antiferromagnetic exchange coupling between the single-ion magnets and the ferromagnetic Ni/Cu(100) substrate. For the latter case, spin-Hamiltonian fits to the XMCD M(H) suggest a significant structural distortion of the molecules. Scanning tunneling microscopy reveals that the molecules are mobile on Au(111) at room temperature, whereas they are more strongly attached on Ni/Cu(100). X-ray photoelectron spectroscopy results provide evidence for the chemical bonding between Er(trensal) molecules and the Ni substrate. Density functional theory calculations support these findings and, in addition, reveal the most stable adsorption configuration on Ni/Cu(100) as well as the Ni-Er exchange path. Our study suggests that the magnetic moment of Er(trensal) can be stabilized via suppression of quantum tunneling of magnetization by exchange coupling to the Ni surface atoms. Moreover, it opens up pathways toward optical addressing of surface-deposited single-ion magnets.
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Affiliation(s)
- Jan Dreiser
- Institute of Condensed Matter Physics, Ecole Polytechnique Fédérale de Lausanne , CH-1015 Lausanne, Switzerland
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Rau IG, Baumann S, Rusponi S, Donati F, Stepanow S, Gragnaniello L, Dreiser J, Piamonteze C, Nolting F, Gangopadhyay S, Albertini OR, Macfarlane RM, Lutz CP, Jones BA, Gambardella P, Heinrich AJ, Brune H. Reaching the magnetic anisotropy limit of a 3d metal atom. Science 2014; 344:988-92. [PMID: 24812206 DOI: 10.1126/science.1252841] [Citation(s) in RCA: 269] [Impact Index Per Article: 26.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Designing systems with large magnetic anisotropy is critical to realize nanoscopic magnets. Thus far, the magnetic anisotropy energy per atom in single-molecule magnets and ferromagnetic films remains typically one to two orders of magnitude below the theoretical limit imposed by the atomic spin-orbit interaction. We realized the maximum magnetic anisotropy for a 3d transition metal atom by coordinating a single Co atom to the O site of an MgO(100) surface. Scanning tunneling spectroscopy reveals a record-high zero-field splitting of 58 millielectron volts as well as slow relaxation of the Co atom's magnetization. This striking behavior originates from the dominating axial ligand field at the O adsorption site, which leads to out-of-plane uniaxial anisotropy while preserving the gas-phase orbital moment of Co, as observed with x-ray magnetic circular dichroism.
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Affiliation(s)
- Ileana G Rau
- IBM Almaden Research Center, 650 Harry Road, San Jose, CA 95120, USA
| | - Susanne Baumann
- IBM Almaden Research Center, 650 Harry Road, San Jose, CA 95120, USA. Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland
| | - Stefano Rusponi
- Institute of Condensed Matter Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | - Fabio Donati
- Institute of Condensed Matter Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | - Sebastian Stepanow
- Department of Materials, Eidgenössische Technische Hochschule (ETH) Zürich, Hönggerbergring 64, CH-8093 Zürich, Switzerland
| | - Luca Gragnaniello
- Institute of Condensed Matter Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | - Jan Dreiser
- Institute of Condensed Matter Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland. Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - Cinthia Piamonteze
- Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - Frithjof Nolting
- Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | | | - Oliver R Albertini
- IBM Almaden Research Center, 650 Harry Road, San Jose, CA 95120, USA. Department of Physics, Georgetown University, 3700 O Street NW, Washington, DC 20057, USA
| | | | | | - Barbara A Jones
- IBM Almaden Research Center, 650 Harry Road, San Jose, CA 95120, USA
| | - Pietro Gambardella
- Department of Materials, Eidgenössische Technische Hochschule (ETH) Zürich, Hönggerbergring 64, CH-8093 Zürich, Switzerland.
| | | | - Harald Brune
- Institute of Condensed Matter Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland.
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Donati F, Dubout Q, Autès G, Patthey F, Calleja F, Gambardella P, Yazyev OV, Brune H. Magnetic moment and anisotropy of individual Co atoms on graphene. Phys Rev Lett 2013; 111:236801. [PMID: 24476294 DOI: 10.1103/physrevlett.111.236801] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2013] [Indexed: 06/03/2023]
Abstract
We report on the magnetic properties of single Co atoms on graphene on Pt(111). By means of scanning tunneling microscopy spin-excitation spectroscopy, we infer a magnetic anisotropy of K=-8.1 meV with out-of-plane hard axis and a magnetic moment of 2.2μ(B). Co adsorbs on the sixfold graphene hollow site. Upon hydrogen adsorption, three differently hydrogenated species are identified. Their magnetic properties are very different from those of clean Co. Ab initio calculations support our results and reveal that the large magnetic anisotropy stems from strong ligand field effects due to the interaction between Co and graphene orbitals.
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Affiliation(s)
- F Donati
- Institute of Condensed Matter Physics (ICMP), Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015, Switzerland
| | - Q Dubout
- Institute of Condensed Matter Physics (ICMP), Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015, Switzerland
| | - G Autès
- Institute of Theoretical Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - F Patthey
- Institute of Condensed Matter Physics (ICMP), Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015, Switzerland
| | - F Calleja
- Institute of Condensed Matter Physics (ICMP), Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015, Switzerland and Madrid Institute for Advanced Studies, IMDEA Nanoscience, Calle Faraday 9, Campus Cantoblanco, E-28049 Madrid, Spain
| | - P Gambardella
- Institute of Condensed Matter Physics (ICMP), Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015, Switzerland and Catalan Institute of Nanoscience and Nanotechnology (ICN2), UAB Campus, E-08193 Barcelona, Spain and Department of Materials, ETH Zurich, CH-8093 Zurich, Switzerland
| | - O V Yazyev
- Institute of Theoretical Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - H Brune
- Institute of Condensed Matter Physics (ICMP), Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015, Switzerland
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Bonany J, Buehler A, Carbó J, Codarin S, Donati F, Echeverria G, Egger S, Guerra W, Hilaire C, Höller I, Iglesias I, Jesionkowska K, Konopacka D, Kruczyńska D, Martinelli A, Pitiot C, Sansavini S, Stehr R, Schoorl F. Consumer eating quality acceptance of new apple varieties in different European countries. Food Qual Prefer 2013. [DOI: 10.1016/j.foodqual.2013.06.004] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Donati F. ["The only thing worse than being talked about is not being talked about" (Oscar Wilde): reply]. Ann Fr Anesth Reanim 2013; 32:452. [PMID: 23680384 DOI: 10.1016/j.annfar.2013.04.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
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Georgescu M, Tanoubi I, Fortier LP, Donati F, Drolet P. Efficacy of preoxygenation with non-invasive low positive pressure ventilation in obese patients: Crossover physiological study. ACTA ACUST UNITED AC 2012; 31:e161-5. [DOI: 10.1016/j.annfar.2012.05.003] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2012] [Accepted: 05/18/2012] [Indexed: 11/28/2022]
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Mosimann UP, Bächli-Biétry J, Boll J, Bopp-Kistler I, Donati F, Kressig RW, Martensson B, Monsch AU, Müri R, Nef T, Rothenberger A, Seeger R, von Gunten A, Wirz U. [Consensus recommendations for the assessment of fitness to drive in cognitively impaired patients]. Praxis (Bern 1994) 2012; 101:451-464. [PMID: 22454307 DOI: 10.1024/1661-8157/a000893] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Memory Clinics provide evidence based diagnosis and treatment of dementia. Whenever a diagnosis of dementia is made, it is important to inform the patients about the possible impact of dementia on driving. Patients and their next of kin require competent advice whenever this difficult question is addressed and the mobility desire and the risks related to driving need to be carefully weight up. The time of diagnosis does not necessarily equate to the time when a person with dementia becomes an unsafe driver. The cause and severity of dementia, comorbidities and the current medication need to be carefully taken into account for this decision. On behalf of the association of the Swiss Memory Clinics, a group of experts has developed recommendations to assess fitness to drive in cognitively impaired older adults.
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Affiliation(s)
- U P Mosimann
- Universitäre Psychiatrische Dienste, Direktion Alterspsychiatrie, Bern.
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Ávila L, Donati F, Cordeiro J. O QUE SE PERDE QUANDO A PSICOSSOMÁTICA É SUBSTITUÍDA PELA SOMATIZAÇÃO? Psic , Saúde & Doenças 2012. [DOI: 10.15309/12psd130111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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Donati F. [Neuromuscular monitoring: knowing, doing, documenting]. Ann Fr Anesth Reanim 2011; 30:779-781. [PMID: 22014534 DOI: 10.1016/j.annfar.2011.09.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
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