Article
Nanoscience & Nanotechnology
Zhang Wei, Huang Tian Xun, Michel Hehn, Gregory Malinowski, Maxime Verges, Julius Hohlfeld, Quentin Remy, Daniel Lacour, Wang Xin Ran, Zhao Guo Ping, Pierre Vallobra, Xu Yong, Stephane Mangin, Zhao Wei Sheng
Summary: This study demonstrates that the laser-magnetic phase transition process induced by femtosecond laser pulses can be mediated by the transient inplane magnetization state, resulting in the formation of topological skyrmions in real time and space domains. By combining experiments and micromagnetic simulations, a two-step process for creating skyrmions through laser pulse irradiation is proposed.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Wei Zhang, Tian Xun Huang, Michel Hehn, Gregory Malinowski, Maxime Verges, Julius Hohlfeld, Quentin Remy, Daniel Lacour, Xin Ran Wang, Guo Ping Zhao, Pierre Vallobra, Yong Xu, Stephane Mangin, Wei Sheng Zhao
Summary: Manipulating magnetic skyrmions using a femtosecond laser pulse has attracted attention due to their potential applications in energy-efficient information-storage devices. However, the mechanism for the creation of skyrmions induced by an fs laser is still unknown, and the challenge lies in understanding the transition from trivial to nontrivial magnetic states.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
C. M. Fernandez-Posada, C. R. S. Haines, D. M. Evans, Z. Yan, E. Bourret, D. Meier, M. A. Carpenter
Summary: The strength and dynamics of magnetoelastic coupling in multiferroic hexagonal ErMnO3 have been investigated through Resonant Ultrasound Spectroscopy. Elastic stiffening and softening are observed during the paramagnetic-antiferromagnetic and antiferromagnetic-ferrimagnetic transitions, respectively. The variation in elastic properties during poling is attributed to piezomagnetic and/or piezoelectric effects. Additionally, changes in acoustic resonance frequencies allow for the detection of ferroelectric domain reconfiguration. A peak in acoustic loss at around 250 K is associated with strain-mediated pinning/freezing of the domain microstructure.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Dexin Yang, Jining Zhou, Juan Hu, Dexuan Huo, Xuefeng Zhang, Michael A. Carpenter
Summary: The strain coupling and relaxation dynamics associated with the ferrimagnetic/ferroelastic phase transition in the double perovskite Ba2FeReO6 have been investigated. The results show that the ferroelastic shear strain, arising from spin/orbit coupling, causes softening of the shear modulus below the transition temperature. The analysis also reveals that the precursor microstructures and mixed magnetic/ferroelastic domains below the transition temperature depend on the thermal history of the sample.
Review
Chemistry, Physical
Se Kwon Kim, Geoffrey S. D. Beach, Kyung-Jin Lee, Teruo Ono, Theo Rasing, Hyunsoo Yang
Summary: Ferrimagnets, composed of multiple antiferromagnetically coupled magnetic elements, offer advantages of both ferromagnets and antiferromagnets, including easy control of magnetization by external field, faster dynamics than ferromagnets, and potential for high-density devices. This Review provides a summary of recent progress in ferrimagnetic spintronics, focusing on functionalities such as spin transport, spin texture dynamics, and all-optical switching.
Article
Chemistry, Multidisciplinary
Boris Seng, Daniel Schoenke, Javier Yeste, Robert M. Reeve, Nico Kerber, Daniel Lacour, Jean-Lois Bello, Nicolas Bergeard, Fabian Kammerbauer, Mona Bhukta, Tom Ferte, Christine Boeglin, Florin Radu, Radu Abrudan, Torsten Kachel, Stephane Mangin, Michel Hehn, Mathias Klaeui
Summary: Chiral spin structures in ferrimagnetic Ta/Ir/Fe/GdFeCo/Pt multilayers were studied using scanning electron microscopy with polarization analysis (SEMPA) as a function of temperature. GdFeCo ferrimagnet exhibited right-handed Neel-type domain wall (DW) spin textures over a large temperature range, indicating a negative Dzyaloshinskii-Moriya interaction from both the top Fe/Pt and Co/Pt interfaces. Measurements of the DW width and complementary magnetic characterization confirmed the relatively constant exchange stiffness with temperature, supporting theoretical predictions. Additionally, a pure Neel-type skyrmionium was identified through direct imaging, showing potential for application in next-generation spintronic devices due to the expected vanishing skyrmion Hall angle.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Physics, Applied
Jintao Shuai, Robbie G. Hunt, Thomas A. Moore, John E. Cunningham
Summary: Surface acoustic waves (SAWs) have potential for energy-efficient control of magnetic domain walls (DWs) due to the magnetoelastic coupling effect. However, the dissipation of RF power in a SAW device can cause heating and affect the DW motion. This study measured the heating of a SAW device and evaluated the DW velocity in a thin film, finding that heating plays a major role in promoting DW motion and magnetoelastic coupling is more important than heating for enhanced DW motion.
PHYSICAL REVIEW APPLIED
(2023)
Article
Nanoscience & Nanotechnology
Rahil Hosseinifar, Evangelos Golias, Ivar Kumberg, Quentin Guillet, Karl Frischmuth, Sangeeta Thakur, Mario Fix, Manfred Albrecht, Florian Kronast, Wolfgang Kuch
Summary: In this study, we investigated the all-optical magnetic toggle switching of a ferrimagnetic Gd26Fe74 film using X-ray magnetic circular dichroism photoelectron emission microscopy. We found that the sample magnetization can be reversed by linearly polarized laser pulses above a certain threshold fluence, independent of the magnetization direction. However, there are local deviations from this deterministic behavior near magnetic domain walls, which can be attributed to extrinsic effects and the magnetic domain structure of the sample.
BEILSTEIN JOURNAL OF NANOTECHNOLOGY
(2022)
Article
Physics, Multidisciplinary
Chen-Rui Zhao, Yun-Xin Wei, Ting-Ting Liu, Ming-Hui Qin
Summary: In this study, the dynamics of ferrimagnetic domain walls driven by a sinusoidal microwave magnetic field were investigated theoretically and numerically. It was found that the domain wall velocity can be modulated by tuning the field frequency, and the biaxial anisotropy and other parameters also have an impact on the domain wall velocity.
ACTA PHYSICA SINICA
(2023)
Article
Materials Science, Multidisciplinary
T. T. Liu, Y. Liu, Z. Jin, Z. P. Hou, D. Y. Chen, Z. Fan, M. Zeng, X. B. Lu, X. S. Gao, M. H. Qin, J-M Liu
Summary: This paper investigates the excitation and propagation of spin waves inside magnetic domain walls and proposes that the handedness of low-energy spin-wave excitations can be controlled by tuning the net angular momentum in a ferrimagnetic domain wall. The results suggest that ferrimagnetic walls can serve as filters for specific handedness of spin waves, with lower energy consumption and faster group velocities compared to spin waves inside the domain. The paper also reveals the current-induced spin-wave Doppler shift in the ferrimagnetic wall, which can be controlled by the net angular momentum.
Article
Chemistry, Multidisciplinary
Lazar L. Kish, Alex Thaler, Minseong Lee, Alexander Zakrzewski, Dalmau Reig-i-Plessis, Brian A. Wolin, Xu Wang, Kenneth C. Littrell, Raffi Budakian, Haidong D. Zhou, Zheng Gai, Matthias D. Frontzek, Vivien S. Zapf, Adam A. Aczel, Lisa DeBeer-Schmitt, Gregory J. MacDougall
Summary: This research reveals stripe-like magnetization patterns in mechanically strained samples of Mn3O4 and MnV2O4, which can be controlled via applied magnetic field and mechanical stress. These magnetic phenomena are directly related to the magnetoelastic and magnetodielectric response functions of the materials.
Article
Materials Science, Multidisciplinary
Quynh Anh T. Nguyen, Thi H. Ho, Myung-Hwa Jung, Sonny H. Rhim
Summary: The effect of Co substitution on Mn3Ga was examined using first-principles study, revealing that Mn3Ga prefers tetragonal phase when Co concentration (x) is less than or equal to 0.5, and cubic phase when x is greater than or equal to 0.5. The ferrimagnetic property remains robust regardless of x in both phases.
CURRENT APPLIED PHYSICS
(2023)
Article
Materials Science, Ceramics
V. L. O. Freitas, S. S. Costa, C. J. Pacheco, B. P. Alho, P. O. Ribeiro, P. J. von Ranke, V. S. R. de Sousa, E. P. Nobrega
Summary: This study investigates the magnetic and magnetocaloric properties of amorphous alloys formed by the Gd55FexAl45-x series. A theoretical model based on Handrich's approximation is proposed to study the systems, aiming to understand the impact of Fe substitution for Al on magnetism and magnetocaloric effect. Through experimental and theoretical analysis, the physical mechanisms involved in the ferrimagnetic transitions of these amorphous alloys are explored.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Physics, Multidisciplinary
Chen Luo, Kai Chen, Victor Ukleev, Sebastian Wintz, Markus Weigand, Radu-Marius Abrudan, Karel Prokes, Florin Radu
Summary: In this study, the authors investigate the magnetic domain walls of ferrimagnetic skyrmions in DyCo3 using scanning transmission X-ray microscopy (STXM) and X-ray magnetic linear dichroism (XMLD). They find that the domain walls of ferrimagnetic skyrmions in this material are of the Neel type. Micromagnetic simulations support these findings and provide insights into the nature of the Dzyaloshinskii-Moriya interaction (DMI) in ferrimagnetic systems, contributing to our understanding of control over chiral spin texture in these materials.
COMMUNICATIONS PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Yu Tao, Luke Daemen, Yongqiang Cheng, Joerg C. Neuefeind, Despina Louca
Summary: Neutron scattering and first-principles calculations were used to study topological quantum magnets FeSn and Fe3Sn2. Both materials are metallic and have dispersionless flat bands with Dirac nodes at the K point. The localized structure of both compounds was not observed, indicating their metallic nature. In FeSn, the lattice constant in the c-axis decreased anomalously along with changes in the phonon spectra, suggesting the presence of magnetoelastic coupling and spin-phonon interactions. In contrast, Fe3Sn2 did not show any lattice anomaly, and the inelastic signal was mostly due to phonons.
Review
Physics, Condensed Matter
Yan Chen, Boyuan Gou, Bincheng Yuan, Xiangdong Ding, Jun Sun, Ekhard K. H. Salje
Summary: This article introduces various physical processes that can cause avalanches in materials, as well as methods to distinguish between these processes and a new approach to measure the relationship between avalanche energy and amplitude. It is noted that the energy and amplitude of avalanches are not universal constants, but depend on the avalanche mechanism, with examples of multi-branching effects shown in different materials.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Xiaomei He, Suzhi Li, Xiangdong Ding, Jun Sun, Sergey Kustov, Ekhard K. H. Salje
Summary: This study presents the first attempt to investigate the internal friction of complex ferroelastic twin patterns using atomistic molecular dynamics simulations. Linear and non-linear internal friction regimes are observed at different stress amplitudes, separated by a pinning/depinning threshold. The motion of twin boundaries generates non-linear anelasticity, where the stress-dependent internal friction increases to a maximum and then decays. The internal friction is directly related to the motion of needle twins.
Article
Chemistry, Physical
Bin Gu, Daniel Munoz-Santiburcio, Fabrizio Cleri, Emilio Artacho, Jorge Kohanoff, Fabiana Da Pieve
Summary: The electronic stopping power (Se) of water vapor, hydrogen, and oxygen gases for protons was calculated using real-time time-dependent density functional theory. The results were compared to experimental and SRIM data, and the applicability of the Bragg's Additivity Rule was validated. The contributions of hydrogen and oxygen atoms to the electronic stopping power were also analyzed, revealing slight differences due to the neglected bond contributions in SRIM.
RADIATION PHYSICS AND CHEMISTRY
(2022)
Article
Multidisciplinary Sciences
Natalia E. E. Koval, Peter Koval, Fabiana Da Pieve, Jorge Kohanoff, Emilio Artacho, Dimitris Emfietzoglou
Summary: This work presents ab initio calculations of the energy loss function (ELF) and inelastic scattering cross sections in liquid water using linear-response time-dependent density functional theory. The results show good agreement with recent calculations and experimental data. The study also provides an analysis of the contributions of different molecular orbitals, species, and orbital angular momenta to the total ELF, as well as single-differential cross sections for each molecular orbital channel, which can be useful for Monte Carlo track-structure simulations.
ROYAL SOCIETY OPEN SCIENCE
(2022)
Article
Physics, Applied
Yangyang Xu, Guomang Shao, Yumei Zhou, Yu Wang, Sen Yang, Xiangdong Ding, Jun Sun, E. K. H. Salje, Turab Lookman, Dezhen Xue
Summary: A ferroelectric phase transition in barium titanate single crystals under an external electric field is observed, showing scale invariant nucleation and growth of complex domain structures. The energy exponent varies with the external bias and cooling history, with the exponent being near 1.68±0.022 for a single-domain sample after field cooling and 1.66 for a multi-domain sample after zero field cooling under high fields. The complex domain patterns in the multi-domain sample hinder the movement of the phase boundary and generate more small energy signals, resulting in a high critical exponent. The aftershock time distribution remains the same for all switching conditions with Omori exponent near -1 and switching time correlations of -1±0.05 for short times and -2±0.10 for long times.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Physical
E. K. H. Salje, S. Kustov
Summary: Domain walls and ferroelastic twin boundaries play important roles in the diffusion of chemical dopants and lattice defects. They can serve as templates for chemical structures and carry dopants when moved. However, the activation of this mechanism depends on the external force applied. This article discusses various experimental methods and approaches in this field.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Nanoscience & Nanotechnology
Jack T. Eckstein, Michael A. Carpenter, Ekhard K. H. Salje
Summary: Systematic advances in acoustic emission (AE) spectroscopy have allowed for its applications in various fields, including medicine and minerals. This paper demonstrates the analysis of biological samples (kidney stones) and porous geological materials using AE, providing insights for further applications in medicine and geology.
Article
Multidisciplinary Sciences
Irina V. V. Lebedeva, Alberto Garcia, Emilio Artacho, Pablo Ordejon
Summary: We propose a modular approach to design efficient and massively parallel solvers for electronic structure calculations. We demonstrate the modular implementation of the orbital minimization method using external libraries, and utilize DBCSR and ScaLAPACK libraries for algebraic operations. We also compare the performance of different scaling algorithms and showcase the superiority of linear-scaling solvers over the cubic-scaling solvers for insulating systems.
ROYAL SOCIETY OPEN SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Johannes L. Teunissen, Thomas Jarrin, Nicolas Richard, Natalia E. Koval, Daniel Munoz Santiburcio, Jorge Kohanoff, Emilio Artacho, Fabrizio Cleri, Fabiana Da Pieve
Summary: Understanding the generation and evolution of defects induced by ion irradiation is vital for estimating the degradation of material properties. This study investigates collision cascades in GaAs and demonstrates the significant impact of electronic stopping on the number of defects. The results also contribute to discussions on estimating material degradation using nonionizing energy loss models.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Physics, Applied
E. K. H. Salje
Summary: K.A. Muller mentored work outside IBM on Ferroic and Polaronic Materials already in the 1970s and showed a keen interest in any progress made in these fields afterwards. He supported particularly research of the fer-roelastic materials SrTiO3 and LaAlO3. He was also fascinated by research into polaronic states of WO3 and their effect on ferroic properties in perovskite samples. This demonstrates that his activities were not restricted to superconductivity but extended more generally in solid-state sciences including the field of phase transitions and pattern formations in nanomaterials.
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
(2023)
Article
Multidisciplinary Sciences
Cam-Phu Thi Nguyen, Peggy Schoenherr, Ekhard K. H. Salje, Jan Seidel
Summary: The authors propose a method called crackling noise microscopy, which is based on AFM nanoindentation, to measure the crackling of individual nanoscale features. They use this method to study crackling noise and avalanches in ferroelectric materials. The crackling noise is a scale-invariant phenomenon found in various nonlinear dynamical material systems, and avalanches follow universal scaling rules described by power laws. The concept of crackling noise is widely used in different fields such as earthquake research and neural networks.
NATURE COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Xiaomei He, Xiangdong Ding, Jun Sun, Guillaume F. F. Nataf, Ekhard K. H. Salje
Summary: In this study, molecular dynamics simulations were performed to identify the ridges and valleys with rounded singularities around the intersections between twin walls and surfaces. The two dominant length scales observed were due to the elastic bending of the surface layer and local atomic reshuffles. For static twin walls, the change in Young's modulus involved softening near valleys and hardening near ridges. The boundary-induced changes in the surface Young's modulus were approximately 0.7%.
Article
Physics, Multidisciplinary
Francesco Cordero, Francesco Trequattrini, Paulo Sergio da Silva Jr, Michel Venet, Oktay Aktas, Ekhard K. H. Salje
Summary: Elastic softening in Ba1-xSrxTiO3 paraelectric phases is most pronounced near the transition temperatures and gradually decreases during heating, extending to the highest measured temperature for Ba-rich compounds. The excess compliance of the precursor softening follows a power law relationship with temperature, with different characteristic exponents ranging from 1.5 in SrTiO3 to 0.2 in BaTiO3. The softening is described by extremely low Vogel-Fulcher energies, indicating a change from a displacive to a weakly order-disorder character of the elastic precursor. The high-temperature elastic properties of these materials are significantly affected by precursor softening, as the elastic softening remains at about 33% of the unsoftened Young's modulus even at temperatures as high as 750 K in BaTiO3.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Physics, Multidisciplinary
Wei Tan, Boyuan Gou, Xiangdong Ding, Jun Sun, Ekhard K. H. Salje
Summary: The characterization of filiform corrosion of Mg in NaCl solution was conducted using acoustic emission spectroscopy, measurements of the free-corrosion potential, and optical observations under in situ conditions. Three stages of corrosion were identified, along with the mechanisms involved.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Chemistry, Physical
Iker Ortiz de Luzuriaga, Sawssen Elleuchi, Khaled Jarraya, Emilio Artacho, Xabier Lopez, Adria Gil
Summary: The computational study of DNA and its interaction with ligands is important for developing new therapeutic strategies. However, the complexity of such systems poses challenges in considering different types of interactions simultaneously. This study compares various computational methods and demonstrates the efficiency and accuracy of LS-DFT and DLPNO-CCSD(T) in describing the interaction of small molecules and cations with DNA.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
