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Hu Y, Picher M, Palluel M, Daro N, Freysz E, Stoleriu L, Enachescu C, Chastanet G, Banhart F. Laser-Driven Transient Phase Oscillations in Individual Spin Crossover Particles. Small 2023; 19:e2303701. [PMID: 37246252 DOI: 10.1002/smll.202303701] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Indexed: 05/30/2023]
Abstract
An unusual expansion dynamics of individual spin crossover nanoparticles is studied by ultrafast transmission electron microscopy. After exposure to nanosecond laser pulses, the particles exhibit considerable length oscillations during and after their expansion. The vibration period of 50-100 ns is of the same order of magnitude as the time that the particles need for a transition from the low-spin to the high-spin state. The observations are explained in Monte Carlo calculations using a model where elastic and thermal coupling between the molecules within a crystalline spin crossover particle govern the phase transition between the two spin states. The experimentally observed length oscillations are in agreement with the calculations, and it is shown that the system undergoes repeated transitions between the two spin states until relaxation in the high-spin state occurs due to energy dissipation. Spin crossover particles are therefore a unique system where a resonant transition between two phases occurs in a phase transformation of first order.
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Affiliation(s)
- Yaowei Hu
- Institut de Physique et Chimie des Matériaux UMR 7504, Université de Strasbourg & CNRS, Strasbourg, 67034, France
| | - Matthieu Picher
- Institut de Physique et Chimie des Matériaux UMR 7504, Université de Strasbourg & CNRS, Strasbourg, 67034, France
| | - Marlène Palluel
- Université de Bordeaux, CNRS, Bordeaux INP (ICMCB-UMR 5026), Pessac, 33600, France
| | - Nathalie Daro
- Université de Bordeaux, CNRS, Bordeaux INP (ICMCB-UMR 5026), Pessac, 33600, France
| | - Eric Freysz
- Université de Bordeaux, CNRS UMR 5798, LOMA, Talence cedex, 33405, France
| | - Laurentiu Stoleriu
- Faculty of Physics, Alexandru Ioan Cuza University, Iasi, 700506, Romania
| | - Cristian Enachescu
- Faculty of Physics, Alexandru Ioan Cuza University, Iasi, 700506, Romania
| | - Guillaume Chastanet
- Université de Bordeaux, CNRS, Bordeaux INP (ICMCB-UMR 5026), Pessac, 33600, France
| | - Florian Banhart
- Institut de Physique et Chimie des Matériaux UMR 7504, Université de Strasbourg & CNRS, Strasbourg, 67034, France
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Celano U, Zhong H, Ciubotaru F, Stoleriu L, Stark A, Rickhaus P, de Oliveira FF, Munsch M, Favia P, Korytov M, Van Marcke P, Maletinsky P, Adelmann C, van der Heide P. Probing Magnetic Defects in Ultra-Scaled Nanowires with Optically Detected Spin Resonance in Nitrogen-Vacancy Center in Diamond. Nano Lett 2021; 21:10409-10415. [PMID: 34882420 DOI: 10.1021/acs.nanolett.1c03723] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Magnetic nanowires (NWs) are essential building blocks of spintronics devices as they offer tunable magnetic properties and anisotropy through their geometry. While the synthesis and compositional control of NWs have seen major improvements, considerable challenges remain for the characterization of local magnetic features at the nanoscale. Here, we demonstrate nonperturbative field distribution mapping in ultrascaled magnetic nanowires with diameters down to 6 nm by scanning nitrogen-vacancy magnetometry. This enables localized, minimally invasive magnetic imaging with sensitivity down to 3 μT Hz-1/2. The imaging reveals the presence of weak magnetic inhomogeneities inside in-plane magnetized nanowires that are largely undetectable with standard metrology and can be related to local fluctuations of the NWs' saturation magnetization. In addition, the strong magnetic field confinement in the nanowires allows for the study of the interaction between the stray magnetic field and the nitrogen-vacancy sensor, thus clarifying the contrasting formation mechanisms for technologically relevant magnetic nanostructures.
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Affiliation(s)
- Umberto Celano
- imec, Kapeldreef 75, 3001, Leuven, Belgium
- Faculty of Science and Technology and MESA+ Institute for Nanotechnology, University of Twente, 7500 Enschede, The Netherlands
| | - Hai Zhong
- Qnami AG, Hofackerstrasse 40B, 4132 Muttenz, Switzerland
| | | | - Laurentiu Stoleriu
- Department of Physics, Alexandru Ioan Cuza University, Bd. Carol I 11, 700506 Iasi, Romania
| | | | - Peter Rickhaus
- Qnami AG, Hofackerstrasse 40B, 4132 Muttenz, Switzerland
| | | | - Mathieu Munsch
- Qnami AG, Hofackerstrasse 40B, 4132 Muttenz, Switzerland
| | | | | | | | - Patrick Maletinsky
- Qnami AG, Hofackerstrasse 40B, 4132 Muttenz, Switzerland
- Department of Physics, University of Basel, Klingelbergstrasse 82, Basel CH-4056, Switzerland
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Hu Y, Picher M, Tran NM, Palluel M, Stoleriu L, Daro N, Mornet S, Enachescu C, Freysz E, Banhart F, Chastanet G. Photo-Thermal Switching of Individual Plasmonically Activated Spin Crossover Nanoparticle Imaged by Ultrafast Transmission Electron Microscopy. Adv Mater 2021; 33:e2105586. [PMID: 34601766 DOI: 10.1002/adma.202105586] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Revised: 09/22/2021] [Indexed: 06/13/2023]
Abstract
Spin crossover (SCO) is a promising switching phenomenon when implemented in electronic devices as molecules, thin films or nanoparticles. Among the properties modulated along this phenomenon, optically induced mechanical changes are of tremendous importance as they can work as fast light-induced mechanical switches or allow to investigate and control microstructural strains and fatigability. The development of characterization techniques probing nanoscopic behavior with high spatio-temporal resolution allows to trigger and visualize such mechanical changes of individual nanoscopic objects. Here, ultrafast transmission electron microscopy (UTEM) is used to precisely probe the length changes of individual switchable nanoparticles induced thermally by nanosecond laser pulses. This allows revealing of the mechanisms of spin switching, leading to the macroscopic expansion of SCO materials. This study is conducted on individual pure SCO nanoparticles and SCO nanoparticles encapsulating gold nanorods that serve for plasmonic heating under laser pulses. Length changes are compared with time-resolved optical measurements performed on an assembly of these particles.
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Affiliation(s)
- Yaowei Hu
- Institut de Physique et Chimie des Matériaux, UMR 7504 CNRS, Université de Strasbourg, Strasbourg, F-67034, France
| | - Matthieu Picher
- Institut de Physique et Chimie des Matériaux, UMR 7504 CNRS, Université de Strasbourg, Strasbourg, F-67034, France
| | - Ngoc Minh Tran
- Universite de Bordeaux, CNRS, UMR 5798, LOMA, 358 Cours de la libération, Talence cedex, F-33405, France
| | - Marlène Palluel
- Institut de Chimie de la Matière Condensée de Bordeaux, CNRS, Université de Bordeaux, Bordeaux INP, UMR 5026, Pessac, F-33600, France
| | - Laurentiu Stoleriu
- Faculty of Physics, Alexandru Ioan Cuza University, Iasi, 700506, Romania
| | - Nathalie Daro
- Institut de Chimie de la Matière Condensée de Bordeaux, CNRS, Université de Bordeaux, Bordeaux INP, UMR 5026, Pessac, F-33600, France
| | - Stephane Mornet
- Institut de Chimie de la Matière Condensée de Bordeaux, CNRS, Université de Bordeaux, Bordeaux INP, UMR 5026, Pessac, F-33600, France
| | - Cristian Enachescu
- Faculty of Physics, Alexandru Ioan Cuza University, Iasi, 700506, Romania
| | - Eric Freysz
- Universite de Bordeaux, CNRS, UMR 5798, LOMA, 358 Cours de la libération, Talence cedex, F-33405, France
| | - Florian Banhart
- Institut de Physique et Chimie des Matériaux, UMR 7504 CNRS, Université de Strasbourg, Strasbourg, F-67034, France
| | - Guillaume Chastanet
- Institut de Chimie de la Matière Condensée de Bordeaux, CNRS, Université de Bordeaux, Bordeaux INP, UMR 5026, Pessac, F-33600, France
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Bertoni R, Lorenc M, Cailleau H, Tissot A, Laisney J, Boillot ML, Stoleriu L, Stancu A, Enachescu C, Collet E. Elastically driven cooperative response of a molecular material impacted by a laser pulse. Nat Mater 2016; 15:606-10. [PMID: 27019383 DOI: 10.1038/nmat4606] [Citation(s) in RCA: 73] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2015] [Accepted: 02/24/2016] [Indexed: 05/05/2023]
Abstract
Photoinduced phase transformations occur when a laser pulse impacts a material, thereby transforming its electronic and/or structural orders, consequently affecting the functionalities. The transient nature of photoinduced states has thus far severely limited the scope of applications. It is of paramount importance to explore whether structural feedback during the solid deformation has the capacity to amplify and stabilize photoinduced transformations. Contrary to coherent optical phonons, which have long been under scrutiny, coherently propagating cell deformations over acoustic timescales have not been explored to a similar degree, particularly with respect to cooperative elastic interactions. Herein we demonstrate, experimentally and theoretically, a self-amplified responsiveness in a spin-crossover material during its delayed volume expansion. The cooperative response at the material scale prevails above a threshold excitation, significantly extending the lifetime of photoinduced states. Such elastically driven cooperativity triggered by a light pulse offers an efficient route towards the generation and stabilization of photoinduced phases in many volume-changing materials.
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Affiliation(s)
- Roman Bertoni
- Université de Rennes 1, Institut de Physique de Rennes, UMR UR1-CNRS 6251, F-35000 Rennes, France
| | - Maciej Lorenc
- Université de Rennes 1, Institut de Physique de Rennes, UMR UR1-CNRS 6251, F-35000 Rennes, France
| | - Hervé Cailleau
- Université de Rennes 1, Institut de Physique de Rennes, UMR UR1-CNRS 6251, F-35000 Rennes, France
| | - Antoine Tissot
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris Sud, Université Paris-Saclay, CNRS, 91405 Orsay, France
| | - Jérôme Laisney
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris Sud, Université Paris-Saclay, CNRS, 91405 Orsay, France
| | - Marie-Laure Boillot
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris Sud, Université Paris-Saclay, CNRS, 91405 Orsay, France
| | - Laurentiu Stoleriu
- Faculty of Physics, Alexandru Ioan Cuza University, 700506 Iasi, Romania
| | - Alexandru Stancu
- Faculty of Physics, Alexandru Ioan Cuza University, 700506 Iasi, Romania
| | - Cristian Enachescu
- Faculty of Physics, Alexandru Ioan Cuza University, 700506 Iasi, Romania
| | - Eric Collet
- Université de Rennes 1, Institut de Physique de Rennes, UMR UR1-CNRS 6251, F-35000 Rennes, France
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Enachescu C, Stoleriu L, Stancu A, Hauser A. Model for elastic relaxation phenomena in finite 2D hexagonal molecular lattices. Phys Rev Lett 2009; 102:257204. [PMID: 19659117 DOI: 10.1103/physrevlett.102.257204] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2008] [Indexed: 05/28/2023]
Abstract
The relaxation in a spin transition compound is modeled on the basis of molecules interacting by the way of connecting springs and situated in a bidimensional open boundary hexagonal lattice. The switch of individual molecules is randomly checked using a standard Monte Carlo procedure. The switching probability depends on the energy gap between the two states in the absence of interactions and on the elongations of the nearest springs. The main characteristics of the experimental relaxation curves are reproduced and clustering and nucleation phenomena are detected.
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