纳米磁性膜微波特性研究

Investigation of Microwave Electromagnetic Characteristics for the Nanomagnetic Films

采用微磁学动态计算方法模拟计算了镍铁合金在多种条件下的高频磁化率。由计算结果得出磁化率虚部出现了两个共振峰[1]:主的共振峰出现在9G赫兹附近,符合宏观的Landau-Lifshitz(LL)方程的预测,次共振峰是由于磁畴取向在材料边缘出现张开影响产生的。当材料宽度增加时,共振峰整体向低频方向移动;随着材料边沿曲线化程度的加深,次共振峰不断接近主共振峰。

In this article dynamic micromagnetic calculations are used in simulating the high frequency susceptibility of a permalloy stripe in various conditions. The studied structure exhibits two resonance modes. The higher, primary peak is around 9 GHz and can be identified with the uniform resonance mode predicted by the macroscopic Landau -Lifshitz （LL） model. The low frequency peak is attributed to the splay of the magnetization distribution near the end of the stripe. When the material is widen, the frequency peaks move toward low frequency zone together, white the low frequency peak moves faster gqaen the edge of the material is curved, the low frequency peak gets closer to the high frequency peak until they merge, forming a single peak.