变频偏振微波场辅助斯托纳粒子磁矩翻转的动力学研究

Magnetization Reversal of Stoner Particles under Polarized Microwave with Variable Frequencies

文章基于朗道-栗弗席兹-吉尔伯特(Landau-Lifshitz-Gilbert)方程研究了变频偏振微波场辅助斯托纳(Stoner)粒子磁矩翻转的动力学性质。考虑磁单轴各向异性,通过数值模拟研究了磁矩翻转的临界翻转场和对应的微波频率之间的关系。研究表明当偏振微波沿轴﹑轴两个方向的频率均接近于铁磁共振频率时,斯托纳粒子在磁矩翻转过程中需要最小的临界翻转场。这一研究结果有望应用于提高低功耗磁性存储器的存储性能。

Magnetization reversal of Stoner particles was investigated under polarized microwave with variable frequencies based on the Landau-Lifshitz-Gilbert equation. Taking the magnetic uniaxial anisotropy into account,the relationship among the critical switching field and the variable microwave frequencies could be numerically found. It＇s shown that when both frequencies in polarized microwaves are near the ferromagnetic resonance frequency, the minimum critical switching field occurs. The results may help the application on low-consumption magnetic storage devices.