磁性纳米粒子的温度相关磁化动力学
Temperature dependent magnetization dynamics of magnetic nanoparticles
摘要：
最近的实验和理论研究表明，磁性纳米粒子的开关行为可以很好地控制由外部时间相关的磁场。在这项工作中，我们从理论上考察了温度和磁各向异性对单畴磁性纳米粒子（Stoner粒子）的自旋动力学和开关特性的影响。我们的理论工具是朗道Lifshitz吉尔伯特方程扩展到处理有限温度内的Langevine框架。感兴趣的物理量是切换所需的最小场幅度和纳米颗粒的磁矩的相应反转时间。特别是，我们对比静态和随时间变化的外场的情况下，分析阻尼的影响，单轴和立方各向异性。
英文摘要：
Recent experimental and theoretical studies show that the switching behavior of magnetic nanoparticles can be well controlled by external time-dependent magnetic fields. In this work, we inspect theoretically the influence of the temperature and the magnetic anisotropy on the spin-dynamics and the switching properties of single domain magnetic nanoparticles (Stoner-particles). Our theoretical tools are the Landau-Lifshitz-Gilbert equation extended as to deal with finite temperatures within a Langevine framework. Physical quantities of interest are the minimum field amplitudes required for switching and the corresponding reversal times of the nanoparticle's magnetic moment. In particular, we contrast the cases of static and time-dependent external fields and analyze the influence of damping for a uniaxial and a cubic anisotropy.
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