不同结构Sm-Co/α-Fe薄膜体系磁性能的研究

Simulation of Structure-Dependent Magnetic Properties of Sm-Co/α-Fe Exchange Coupled Thin Films

根据微磁学模拟理论,设置交换耦合双层膜中的Sm-Co硬磁层和α-Fe软磁层薄膜总厚度各自保持不变,通过改变结构来研究其对磁化反转过程和磁性能的影响。结果表明,从双层膜变化到三层膜的过程中,不同的结构具有不同的磁性能和磁化反转过程;当结构优化为Sm-Co(10 nm)/α-Fe(5 nm)/Sm-Co(10 nm)三层膜时,最大磁能积和矫顽力达到最大值,分别为1.4×10~6A/m和856.05 k J·m^(-3)。此结论对高性能交换耦合类磁性薄膜的制备具有一定的指导意义。

The magnetic properties of the Sm-Co/α-Fe multilayered exchange coupled thin films were mathematically modeled,theoretically analyzed and numerically simulated in micro-magnetic simulation theory. The influence of the of the thickness of Co layer in the Sm-Co（ 20-x）/α-Fe（ 5 nm）/Sm-Co（ x） trilayer exchange-coupled thin films was investigated. The simulated results show that the transition from the bilayer to the trilayer has a major impact on the magnetization reversal,and that the thickness of Co layer in the trilayer significantly affects the coercivity,energy product and remanence ratio of the exchange coupled thin films. To be specific,when optimized to trilayer with x = 10,the Sm-Co（ 10 nm）/α-Fe（ 5 nm）/Sm-Co（ 10 nm） trilayer has the maximum energy product of856. 05 k J/m3 andthe strongest coercivity of 1. 4 × 10^6A/m. Possible mechanisms responsible for the structure dependent magnetic behavior were also tentatively discussed in a though provoking way.