纳米结构SmCo/FeCo多层薄膜的磁性

研究了用磁控溅射方法制备的纳米结构Sm₂₂Co₇₈单层膜、Sm₂₂Co₇₈/Fe₆₅Co₃₅双层膜及Sm₂₂Co₇₈/Fe₆₅Co₃₅/Sm₂₂Co₇₈三层膜的磁性，特别是双层膜及三层膜系统中的Fe₆₅Co₃₅软磁层厚度d对薄膜剩磁比(M_r/M_s)和矫顽力(H_c)的影响.所有样品的磁滞回线测量表明，该系列薄膜的易磁化轴在膜面内.磁滞回线的单一硬磁相特征，说明SmCo硬磁层与FeCo软磁层之间的交换相互作用使两相很好地复合在一起.在双层膜和三层膜中，M_r/M_s随软磁层厚度d的增加单调上升，而矫顽力随d的变化出现一峰值.通过研究ΔM随磁场H的变化，发现随着软、硬磁相界面数的增加，ΔM曲线的正峰数量逐渐减少；负峰数量逐渐增强，负峰的半高宽逐渐减少. 关键词：

Magnetic Properties of Nanostructured SmCo/FeCo Multilayers

The dependence of reduced remanence (M_r/M_s) and coercivity of Sm₂₂Co₇₈/Fe₆₅Co₃₅ bilayer and Sm₂₂Co₇₈/Fe₆₅Co₃₅/Sm₂₂Co₇₈ triple-layer films on Fe₆₅Co₃₅ soft-magnetic layer thickness d, was systematically investigated. All the hysteresis loops of the films exhibited a single-phase behavior, reflecting a strong exchange coupling between soft-and hard-magnetic phase. M_r/M_s showed a monotonic increase with increasing Fe₆₅Co₃₅ thickness d, and the coercivity would show a peak with increasing d. From the plot of ΔM versus applied field H, it is shown that the positive profile decreases and the negative interaction profile increases with the increase of interfaces between soft-and hard-layers.