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首页> 外文期刊>Physical review >Dynamics at finite temperatures of single-domain particles driven by rotating magnetic fields
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Dynamics at finite temperatures of single-domain particles driven by rotating magnetic fields

机译：旋转磁场驱动的单畴粒子在有限温度下的动力学

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摘要

Recent studies show that the magnetization of nanoparticles with uniaxial anisotropy can be reversed by rotating magnetic fields applied perpendicular to the easy axis. In this contribution the details of this switching process is worked out in detail by solving the Fokker-Planck equation describing the dynamics of the magnetic moment at finite temperatures numerically. The dependence of the induced magnetization due to the rotating field on temperature as well as on frequency and amplitude of the driving field is studied. Of particular interest is the time for switching the magnetization between metastable states. This time is analyzed in detail and it is shown in particular that it increases dramatically with driving frequency. The numerical method developed in this paper is applicable to many other problems in magnetism on the nanoscale.
机译：最近的研究表明，可以通过旋转垂直于易轴的磁场来反转具有单轴各向异性的纳米粒子的磁化强度。在这一贡献中，通过求解Fokker-Planck方程，详细地描述了该切换过程的细节，该方程描述了有限温度下的磁矩的动力学数值。研究了由于旋转磁场引起的感应磁化强度与温度以及驱动磁场的频率和振幅之间的关系。特别令人感兴趣的是在亚稳态之间切换磁化的时间。详细分析了该时间，并特别显示了它随驱动频率的增加而急剧增加。本文开发的数值方法适用于纳米尺度上的许多其他磁性问题。

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