反铁磁纳米粒子的随机运动特性
Peculiarities of the stochastic motion in antiferromagnetic nanoparticles
摘要：
反铁磁（AFM）材料广泛用于自旋电子器件中作为被动元件（用于铁磁层的稳定）和作为主动元件（用于信息编码）。在这两种情况下，不同AFM状态之间的切换在很大程度上取决于环境噪声。本文在广义坐标和动量相空间中导出了AFM矢量的随机Langevin方程和相应的分布函数的Fokker-Planck方程。热噪声由与AFM粒子的动态磁化强度相互作用的随机δ相关磁场来模拟。我们详细分析了一个特殊的情况下，共线补偿原子力显微镜的存在下的自旋极化电流。得到了亚临界和超临界两个平衡态（静态和稳态）附近简正模的能量分布函数，表明AFM矢量的噪声诱导动力学与铁磁体中磁化强度矢量的噪声诱导动力学具有相似性.
英文摘要：
Antiferromagnetic (AFM) materials are widely used in spintronic devices as passive elements (for stabilization of ferromangetic layers) and as active elements (for information coding). In both cases switching between the different AFM states depends in a great extent from the environmental noise. In the present paper we derive the stochastic Langevin equations for an AFM vector and corresponding Fokker-Planck equation for distribution function in the phase space of generalised coordinate and momentum. Thermal noise is modeled by a random delta-correlated magnetic field that interacts with the dynamic magnetisation of AFM particle. We analyse in details a particular case of the collinear compensated AFM in the presence of spin-polarised current. The energy distribution function for normal modes in the vicinity of two equilibrium states (static and stationary) in sub- and super-critical regimes is found. It is shown that the noise-induced dynamics of AFM vector has pecuilarities compared to that of magnetisation vector in ferromagnets.
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