Switching times of nanoscale FePt: finite size effects on linear reversal mechanism
M. O. A. Ellis, R. W. Chantrell
备注：
4 pages, 4 figures. Changes: 1) Abstract and introduction text has been updated. Some new references have been included in the introduction. 2) Figure 1 has been altered to included T* on the inset. 3) New data has been included n figure 3. Figure 3.e has been altered to include the new data and also compares to the LLB equation. 4) Main text has been altered to reflect the new figures
在FePt晶粒的线性反转机制，从2.316 nm到5.404 nm的范围内，已模拟使用原子自旋动力学，参数化从头计算。居里温度和发生线性反转机制的临界温度（T*）随系统尺寸的增大而减小，而温度窗口T* < T < TC增大。接近居里温度的反转路径已被计算，表明对于减小系统尺寸的反转路径在较低的温度下变得更加椭圆，与有限尺寸效应引起的居里温度的降低一致。最小脉冲持续时间的计算显示更快的切换在小晶粒和定性描述的Landau-Lifshitz-Bloch方程与有限尺寸的原子参数化，这表明，多尺度建模FePt的晶粒尺寸为~ 3.5 nm是可能的。
英文摘要：
The linear reversal mechanism in FePt grains ranging from 2.316 nm to 5.404 nm has been simulated using atomistic spin dynamics, parametrized from ab-initio calculations. The Curie temperature and the critical temperature (T*), at which the linear reversal mechanism occurs, are observed to decrease with system size whilst the temperature window T* < T < TC increases. The reversal paths close to the Curie temperature have been calculated, showing that for decreasing system size the reversal path becomes more elliptic at lower temperatures, consistent with the decrease in the Curie temperature arising from finite size effects. Calculations of the minimum pulse duration show faster switching in small grains and is qualitatively described by the Landau-Lifshitz-Bloch equation with finite size atomistic parameterization, which suggests that multiscale modeling of FePt down to a grain size of ~ 3.5 nm is possible.
Decoupling size from magnetism: A length-scale boundary for curvature control in micrometer FePt Janus particles
Institute for Materials Science, University of Stuttgart（斯图加特大学材料科学研究所）；Materials Central Scientific Facility, Max Planck Institute for Intelligent Systems (MPI-IS)（马克斯·普朗克智能系统研究所材料中央科学设施）；Max Planck Institute for Solid State Research（马克斯·普朗克固相研究所）
Nanoscale imaging of spin textures with locally varying altermagnetic response in $α$-Fe$_2$O$_3$
Max Planck Institute for Chemical Physics of Solids（马克斯·普朗克固体化学物理研究所）；International Institute for Sustainability with Knotted Chiral Meta Matter (WPI-SKCM 2 ), Hiroshima University（广岛大学可持续性与打结手性超物质国际研究所）；Paul Scherrer Institut（保罗谢尔研究所）；ETH Zürich（苏黎世联邦理工学院）；Osaka Metropolitan University（大阪公立大学）；Helmholtz-Zentrum Berlin für Materialien und Energie GmbH（柏林亥姆霍兹材料与能源中心）；Universität of Augsburg（奥格斯堡大学）；RIKEN Center for Emergent Matter Science (CEMS)（理化学研究所涌现物质科学中心）；Diamond Light Source（英国钻石光源）
Decoupling effects of the resistive-switching behavior on the polarization reversal in ultrathin ferroelectric Hf0.5Zr0.5O2 films
Harbin Institute of Technology, Shenzhen（哈尔滨工业大学（深圳））；Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area（粤港澳大湾区量子科学中心）；Westlake University（西湖大学）；Indian Institute of Science（印度科学学院）；University of Science and Technology Beijing（北京科技大学）
