玻璃包覆合金微丝的微波磁性能分析及模拟

Analysis and simulation on microwave magnetic properties of glass-coated alloy microwires

基于无限长的单畴圆柱体的微波进动方程,推导了玻璃包覆磁性合金微丝内芯区的微波磁导率,模拟了Fe基合金微丝外壳区的微波磁导率并分析了合金微丝外壳区自然铁磁共振频率的影响因素。根据理论分析结果,模拟了典型的玻璃包覆磁性合金微丝内芯区和外壳区的微波相对复磁导率以及几何尺寸改变时玻璃包覆合金微丝的自然铁磁共振频率的变化规律,探讨了几何尺寸对玻璃包覆磁性合金微丝的自然铁磁共振频率的影响规律。结果表明,微丝合金内芯的自然铁磁共振频率主要依赖于合金的饱和磁化强度,Fe基合金微丝合金外壳层的自然铁磁共振频率依赖于磁各向异性等效场,自然铁磁共振频率可以通过改变合金微丝的几何尺寸而控制。

The inner core microwave permeability of glass-coated magnetic alloy microwires was derived based on the precession equation of infinitely long magnetic single domain cylinder. The alloy shell microwave permeability of Fe-based microwires was analyzed. Furthermore, the influencing factors of natural ferromagnetic resonance frequency of alloy microwires were analyzed. The typical microwave relative complex permeability of the inner core and shell, and the variation of nature ferromagnetic resonance on the change of the geometrical size of glass-coated magnetic alloy microwires were simulated based on the theoretically concluded result. The influence regulation of the geometrical size on the natural ferromagnetic resonance frequency of the alloy microwires was discussed. The study result showed that the natural ferromagnetic resonance frequency of alloy inner core of the long microwires depends on the saturated magnetization, and the natural ferromagnetic resonance frequency of Fe-based microwires depends on the equivalent anisotropy field. The nature resonance frequency of the glass-coaed alloy microwires can be controlled by changing the geometrical size.