CoNi镀层长度对软/硬磁微丝微波磁性的影响

采用熔融拉丝法和磁控溅射方法制备了Co_59.1Fe_14.8Si_10.2B_15.9\Au复合结构微丝。研究了硬磁层长度对软磁/硬磁双相磁性微丝的巨磁阻抗效应及微波磁性能的影响。通过测量不同硬磁层长度的软磁/硬磁双相磁性微丝在0.1~14 GHz范围内的巨磁阻抗效应和电阻谱，发现当CoNi镀层长度L=5 mm时，MI谱出现最大值的频率f=1.6 GHz，电阻谱出现两个峰FMR0和FMR1。随着硬磁层长度的增加，一方面MI谱出现最大值的频率向低频段移动，另一方面，发生铁磁共振的损耗也被进一步降低。研究成果可以应用于微波磁性传感器的研发。

Influence of CoNi Coating Length on Microwave Magnetic of Soft/Hard Magnetic Microwires

Co_59.1Fe_14.8Si_10.2B_15.9\Au composite microwires were prepared by melt drawing and magnetron sputtering techniques. The influences of the length of hard magnetic layer on the giant magneto-impedance effect and microwave magnetic properties of soft/hard magnetic dual-phase magnetic microwires were investigated. The giant magneto-impedance effect and resistance spectra of soft/hard magnetic biphasic microwires with different hard layer lengths were measured in a range of working frequencies from 0.1 to 14 GHz. It was found that when the length of CoNi coating L equals to 5 mm， the maximum frequency of giant magneto-impedance effect spectrum reaches 1.6 GHz， and two peaks FMR0 and FMR1 appear in the resistance spectrum. The frequency of the maximum MI spectrum approaches low frequency band， and the loss of ferromagnetic resonance also reduces with the increase of the length of hard magnetic layer. The research results can be applied to the research and development of microwave magnetic sensors.