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Zhai Q, Paga I, Baity-Jesi M, Calore E, Cruz A, Fernandez LA, Gil-Narvion JM, Gonzalez-Adalid Pemartin I, Gordillo-Guerrero A, Iñiguez D, Maiorano A, Marinari E, Martin-Mayor V, Moreno-Gordo J, Muñoz-Sudupe A, Navarro D, Orbach RL, Parisi G, Perez-Gaviro S, Ricci-Tersenghi F, Ruiz-Lorenzo JJ, Schifano SF, Schlagel DL, Seoane B, Tarancon A, Tripiccione R, Yllanes D. Scaling Law Describes the Spin-Glass Response in Theory, Experiments, and Simulations. Phys Rev Lett 2020; 125:237202. [PMID: 33337211 DOI: 10.1103/physrevlett.125.237202] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Accepted: 10/21/2020] [Indexed: 06/12/2023]
Abstract
The correlation length ξ, a key quantity in glassy dynamics, can now be precisely measured for spin glasses both in experiments and in simulations. However, known analysis methods lead to discrepancies either for large external fields or close to the glass temperature. We solve this problem by introducing a scaling law that takes into account both the magnetic field and the time-dependent spin-glass correlation length. The scaling law is successfully tested against experimental measurements in a CuMn single crystal and against large-scale simulations on the Janus II dedicated computer.
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Affiliation(s)
- Q Zhai
- Texas Materials Institute, The University of Texas at Austin, Austin, Texas 78712, USA
| | - I Paga
- Dipartimento di Fisica, Sapienza Università di Roma, INFN, Sezione di Roma I-00185, Italy
- Departamento de Física Teórica, Universidad Complutense, 28040 Madrid, Spain
| | - M Baity-Jesi
- Eawag, Überlandstrasse 133, CH-8600 Dübendorf, Switzerland
| | - E Calore
- Dipartimento di Fisica e Scienze della Terra, Università di Ferrara e INFN, Sezione di Ferrara, I-44122 Ferrara, Italy
| | - A Cruz
- Departamento de Física Teórica, Universidad de Zaragoza, 50009 Zaragoza, Spain
- Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), 50018 Zaragoza, Spain
| | - L A Fernandez
- Departamento de Física Teórica, Universidad Complutense, 28040 Madrid, Spain
- Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), 50018 Zaragoza, Spain
| | - J M Gil-Narvion
- Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), 50018 Zaragoza, Spain
| | | | - A Gordillo-Guerrero
- Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), 50018 Zaragoza, Spain
- Departamento de Ingeniería Eléctrica, Electrónica y Automática, Universidad de Extremadura, 10003 Cáceres, Spain
- Instituto de Computación Científica Avanzada (ICCAEx), Universidad de Extremadura, 06006 Badajoz, Spain
| | - D Iñiguez
- Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), 50018 Zaragoza, Spain
- Fundación ARAID, Diputación General de Aragón, Zaragoza, Spain
| | - A Maiorano
- Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), 50018 Zaragoza, Spain
- Dipartimento di Biotecnologie, Chimica e Farmacia, Università degli studi di Siena, 53100 Siena, Italy
- INFN, Sezione di Roma 1, I-00185 Rome, Italy
| | - E Marinari
- INFN, Sezione di Roma 1, I-00185 Rome, Italy
- Dipartimento di Fisica, Sapienza Università di Roma, and CNR-Nanotec, I-00185 Rome, Italy
| | - V Martin-Mayor
- Departamento de Física Teórica, Universidad Complutense, 28040 Madrid, Spain
- Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), 50018 Zaragoza, Spain
| | - J Moreno-Gordo
- Departamento de Física Teórica, Universidad de Zaragoza, 50009 Zaragoza, Spain
- Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), 50018 Zaragoza, Spain
| | - A Muñoz-Sudupe
- Departamento de Física Teórica, Universidad Complutense, 28040 Madrid, Spain
- Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), 50018 Zaragoza, Spain
| | - D Navarro
- Departamento de Ingeniería, Electrónica y Comunicaciones and I3A, Universidad de Zaragoza, 50018 Zaragoza, Spain
| | - R L Orbach
- Texas Materials Institute, The University of Texas at Austin, Austin, Texas 78712, USA
| | - G Parisi
- INFN, Sezione di Roma 1, I-00185 Rome, Italy
- Dipartimento di Fisica, Sapienza Università di Roma, INFN, and CNR-Nanotec, I-00185 Rome, Italy
| | - S Perez-Gaviro
- Departamento de Física Teórica, Universidad de Zaragoza, 50009 Zaragoza, Spain
- Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), 50018 Zaragoza, Spain
- Escuela Universitaria Politécnica-La Almunia, 50100 La Almunia de Doña Godina, Zaragoza, Spain
| | - F Ricci-Tersenghi
- INFN, Sezione di Roma 1, I-00185 Rome, Italy
- Dipartimento di Fisica, Sapienza Università di Roma, and CNR-Nanotec, I-00185 Rome, Italy
| | - J J Ruiz-Lorenzo
- Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), 50018 Zaragoza, Spain
- Instituto de Computación Científica Avanzada (ICCAEx), Universidad de Extremadura, 06006 Badajoz, Spain
- Departamento de Física, Universidad de Extremadura, 06006 Badajoz, Spain
| | - S F Schifano
- Dipartimento di Scienze Chimiche e Farmaceutiche, Università di Ferrara e INFN Sezione di Ferrara, I-44122 Ferrara, Italy
| | - D L Schlagel
- Division of Materials Science and Engineering, Ames Laboratory, Ames, Iowa 50011, USA
| | - B Seoane
- Departamento de Física Teórica, Universidad Complutense, 28040 Madrid, Spain
- Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), 50018 Zaragoza, Spain
| | - A Tarancon
- Departamento de Física Teórica, Universidad de Zaragoza, 50009 Zaragoza, Spain
- Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), 50018 Zaragoza, Spain
| | - R Tripiccione
- Dipartimento di Fisica e Scienze della Terra, Università di Ferrara e INFN, Sezione di Ferrara, I-44122 Ferrara, Italy
| | - D Yllanes
- Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), 50018 Zaragoza, Spain
- Chan Zuckerberg Biohub, San Francisco, California 94158, USA
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Pappas C, Bannenberg LJ, Lelièvre-Berna E, Qian F, Dewhurst CD, Dalgliesh RM, Schlagel DL, Lograsso TA, Falus P. Magnetic Fluctuations, Precursor Phenomena, and Phase Transition in MnSi under a Magnetic Field. Phys Rev Lett 2017; 119:047203. [PMID: 29341765 DOI: 10.1103/physrevlett.119.047203] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2016] [Indexed: 06/07/2023]
Abstract
The reference chiral helimagnet MnSi is the first system where Skyrmion lattice correlations have been reported. At a zero magnetic field the transition at T_{C} to the helimagnetic state is of first order. Above T_{C}, in a region dominated by precursor phenomena, neutron scattering shows the buildup of strong chiral fluctuating correlations over the surface of a sphere with radius 2π/ℓ, where ℓ is the pitch of the helix. It has been suggested that these fluctuating correlations drive the helical transition to first order following a scenario proposed by Brazovskii for liquid crystals. We present a comprehensive neutron scattering study under magnetic fields, which provides evidence that this is not the case. The sharp first order transition persists for magnetic fields up to 0.4 T whereas the fluctuating correlations weaken and start to concentrate along the field direction already above 0.2 T. Our results thus disconnect the first order nature of the transition from the precursor fluctuating correlations. They also show no indication for a tricritical point, where the first order transition crosses over to second order with increasing magnetic field. In this light, the nature of the first order helical transition and the precursor phenomena above T_{C}, both of general relevance to chiral magnetism, remain an open question.
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Affiliation(s)
- C Pappas
- Delft University of Technology, Mekelweg 15, 2629 JB Delft, Netherlands
| | - L J Bannenberg
- Delft University of Technology, Mekelweg 15, 2629 JB Delft, Netherlands
| | - E Lelièvre-Berna
- Institut Laue-Langevin, 71 Avenue des Martyrs, 38000 Grenoble, France
| | - F Qian
- Delft University of Technology, Mekelweg 15, 2629 JB Delft, Netherlands
| | - C D Dewhurst
- Institut Laue-Langevin, 71 Avenue des Martyrs, 38000 Grenoble, France
| | - R M Dalgliesh
- STFC, ISIS, Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom
| | - D L Schlagel
- Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA
| | - T A Lograsso
- Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA
| | - P Falus
- Institut Laue-Langevin, 71 Avenue des Martyrs, 38000 Grenoble, France
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3
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Rettig L, Dornes C, Thielemann-Kühn N, Pontius N, Zabel H, Schlagel DL, Lograsso TA, Chollet M, Robert A, Sikorski M, Song S, Glownia JM, Schüßler-Langeheine C, Johnson SL, Staub U. Itinerant and Localized Magnetization Dynamics in Antiferromagnetic Ho. Phys Rev Lett 2016; 116:257202. [PMID: 27391747 DOI: 10.1103/physrevlett.116.257202] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Indexed: 05/19/2023]
Abstract
Using femtosecond time-resolved resonant magnetic x-ray diffraction at the Ho L_{3} absorption edge, we investigate the demagnetization dynamics in antiferromagnetically ordered metallic Ho after femtosecond optical excitation. Tuning the x-ray energy to the electric dipole (E1, 2p→5d) or quadrupole (E2, 2p→4f) transition allows us to selectively and independently study the spin dynamics of the itinerant 5d and localized 4f electronic subsystems via the suppression of the magnetic (2 1 3-τ) satellite peak. We find demagnetization time scales very similar to ferromagnetic 4f systems, suggesting that the loss of magnetic order occurs via a similar spin-flip process in both cases. The simultaneous demagnetization of both subsystems demonstrates strong intra-atomic 4f-5d exchange coupling. In addition, an ultrafast lattice contraction due to the release of magneto-striction leads to a transient shift of the magnetic satellite peak.
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Affiliation(s)
- L Rettig
- Swiss Light Source, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
- Current Address: Abteilung Physikalische Chemie, Fritz-Haber-Institut der MPG, Faradayweg 4-6, D-14195 Berlin, Germany
| | - C Dornes
- Institute for Quantum Electronics, Physics Department, ETH Zürich, 8093 Zürich, Switzerland
| | - N Thielemann-Kühn
- Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Straße 15, 12489 Berlin, Germany
- Institut für Physik und Astronomie, Universität Potsdam, Karl-Liebknecht-Straße 24/25, 14476 Potsdam-Golm, Germany
| | - N Pontius
- Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Straße 15, 12489 Berlin, Germany
| | - H Zabel
- Institute for Experimental Physics, Ruhr-Universität Bochum, 44780 Bochum, Germany
| | - D L Schlagel
- Division of Materials Sciences and Engineering, Ames Laboratory, Ames, Iowa 50011, USA
| | - T A Lograsso
- Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011, USA
| | - M Chollet
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - A Robert
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - M Sikorski
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - S Song
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - J M Glownia
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - C Schüßler-Langeheine
- Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Straße 15, 12489 Berlin, Germany
| | - S L Johnson
- Institute for Quantum Electronics, Physics Department, ETH Zürich, 8093 Zürich, Switzerland
| | - U Staub
- Swiss Light Source, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
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Singh S, Rawat R, Muthu SE, D'Souza SW, Suard E, Senyshyn A, Banik S, Rajput P, Bhardwaj S, Awasthi AM, Ranjan R, Arumugam S, Schlagel DL, Lograsso TA, Chakrabarti A, Barman SR. Spin-valve-like magnetoresistance in Mn2NiGa at room temperature. Phys Rev Lett 2012; 109:246601. [PMID: 23368355 DOI: 10.1103/physrevlett.109.246601] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2012] [Indexed: 06/01/2023]
Abstract
Spin valves have revolutionized the field of magnetic recording and memory devices. Spin valves are generally realized in thin film heterostructures, where two ferromagnetic (FM) layers are separated by a nonmagnetic conducting layer. Here, we demonstrate spin-valve-like magnetoresistance at room temperature in a bulk ferrimagnetic material that exhibits a magnetic shape memory effect. The origin of this unexpected behavior in Mn(2)NiGa has been investigated by neutron diffraction, magnetization, and ab initio theoretical calculations. The refinement of the neutron diffraction pattern shows the presence of antisite disorder where about 13% of the Ga sites are occupied by Mn atoms. On the basis of the magnetic structure obtained from neutron diffraction and theoretical calculations, we establish that these antisite defects cause the formation of FM nanoclusters with parallel alignment of Mn spin moments in a Mn(2)NiGa bulk lattice that has antiparallel Mn spin moments. The direction of the Mn moments in the soft FM cluster reverses with the external magnetic field. This causes a rotation or tilt in the antiparallel Mn moments at the cluster-lattice interface resulting in the observed asymmetry in magnetoresistance.
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Affiliation(s)
- Sanjay Singh
- UGC-DAE Consortium for Scientific Research, Khandwa Road, Indore 452001, India
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Bondino F, Brinkman A, Zangrando M, Carbone F, van der Marel D, Schlagel DL, Lograsso TA, Gschneidner KA, Pecharsky VK, Parmigiani F. Experimental investigation of the electronic structure of Gd(5)Ge(2)Si(2) by photoemission and x-ray absorption spectroscopy. J Phys Condens Matter 2007; 19:186219. [PMID: 21691000 DOI: 10.1088/0953-8984/19/18/186219] [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] [Indexed: 05/30/2023]
Abstract
The electronic structure of the magnetic refrigerant Gd(5)Ge(2)Si(2) has been experimentally investigated by photoemission and x-ray absorption spectroscopy. The resonant photoemission and x-ray absorption measurements performed across the Gd N(4,5) and Gd M(4,5) edges identify the position of Gd 4f multiplet lines, and assess the 4f occupancy (4f(7)) and the character of the states close to the Fermi edge. The presence of Gd 5d states in the valence band suggests that an indirect 5d exchange mechanism underlies the magnetic interactions between Gd 4f moments in Gd(5)Ge(2)Si(2). From 175 to 300 K the first 4 eV of the valence band and the Gd partial density of states do not display clear variations. A significant change is instead detected in the photoemission spectra at higher binding energy, around 5.5 eV, likely associated to the variation of the bonding and antibonding Ge(Si) s bands across the phase transition.
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Affiliation(s)
- F Bondino
- Laboratorio Nazionale TASC INFM-CNR, Basovizza-Trieste, Italy
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