Nd_2Fe_(14)B/α-Fe双层膜和多层梯度膜磁反转过程的微磁学模拟

Micromagnetic simulation on magnetization reversal process of Nd_2Fe_(14)B/α-Fe bilayers and multilayer gradient films

利用微磁学有限差分计算方法,详细研究了软/硬磁层总厚度固定不变,结构的变化对Nd2Fe14B/α-Fe双层膜和Nd2Fe14B/α-Fe/Nd2Fe14B多层梯度膜的磁性能和磁反转过程的影响。结果表明,从双层膜变化到多层梯度膜的过程中,不同的结构具有不同的磁性能和磁反转过程;当结构优化为Nd2Fe14B(10 nm)/α-Fe(5 nm)/Nd2Fe14B(10 nm)多层梯度膜时,磁滞回线台阶消失,矫顽力大幅度降低。此结论对交换耦合梯度介质的实验设置具有一定的指导意义。

Influence of structure on magnetic properties and magnetization reversal process of Nd2Fe14B/α-Fe bilayers and Nd2Fe14B/α-Fe/Nd2Fe14 B multilayer gradient films were investigated by using micromagnetic simulation software OOMMF. The result shows that magnetization reversal process and magnetic properties change with the film structures changing from bilayers to multilayer gradient films; when the structure is optimized to Nd2Fe14B（10 nm）/α-Fe（5 nm）/Nd2Fe14B（10 nm） multilayer gradient films, the step of the hysteresis loop disappears, and the coercivity is reduced. The conculusion is of significant guidance to the experimental setting of exchange coupled gradient media.