Resonant suppression of thermal stability of the nanoparticle magnetization by a rotating magnetic field
Resonant suppression of thermal stability of the nanoparticle magnetization by a rotating magnetic field
复制标题
旋转磁场对纳米粒子磁化热稳定性的共振抑制
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
T. V. Lyutyy
中科院分区：
文献类型：
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作者：
S. Denisov;A. Polyakov;T. V. Lyutyy
我们研究了旋转磁场诱导的纳米颗粒磁矩的周期（P）和准周期（Q）进动模式的热稳定性。在高各向异性势垒和小振幅的旋转场的情况下，用于确定的P模式的寿命的分析方法，开发内的福克-普朗克形式主义。在一般情况下，通过对随机Landau-Lifshitz方程的数值模拟，研究了P模和Q模的热稳定性。我们分析和数值计算表明，寿命是一个非单调函数的旋转场频率，这取决于场旋转的方向，有一个明显的最大值或深最小值附近的拉莫尔频率。
We study the thermal stability of the periodic (P) and quasiperiodic (Q) precessional modes of the nanoparticle magnetic moment induced by a rotating magnetic field. An analytical method for determining the lifetime of the P mode, in the case of high anisotropy barrier and small amplitudes of the rotating field, is developed within the Fokker-Planck formalism. In general case, the thermal stability of both P and Q modes is investigated by numerical simulation of the stochastic Landau-Lifshitz equation. We show analytically and numerically that the lifetime is a nonmonotonic function of the rotating field frequency, which, depending on the direction of field rotation, has either a pronounced maximum or a deep minimum near the Larmor frequency.