Magneto-Optical Properties of Co/Noblemetal Artificial Superlattices

Pd/Co和Pt/Co多层膜具有很大的垂直磁各向异性，有望成为高密度磁光记录材料的候选材料。本文研究了射频溅射法制备的Pd/Co和Pt/Co多层膜的磁光特性。Pd/Co和Pt/Co多层膜的磁光Kerr谱与PdCo和PtCo合金相似，克尔转角大于Co层的预期。多层膜的克尔光谱受多层膜结构的影响。我们考虑了多重反射效应和界面效应(合金化效应)。通过计算研究了多次反射的影响，发现多次反射的影响很小。克尔转角随周期的增加而减小，即随着界面层的减少而减小。结果表明，Pd/Co和Pt/Co多层膜的克尔旋转主要是由界面引起的，我们还研究了Ir/Co和Rh/Co多层膜的Kerr谱，发现这些谱与Co谱相似。

Pd/Co and Pt/Co multilayers have a large perpendicular magnetic anisotropy and are expected candidates for high density magneto-optical recording material. In this research, magneto-optical properties of Pd/Co and Pt/Co multilayers prepared by RF sputtering method have been investigated. Magneto-optical Kerr spectra of Pd/Co and Pt/Co multilayers resemble those of PdCo and PtCo alloys and the Kerr rotation is larger than was expected of Co layers. The Kerr spectra of multilayers are affected by the multilayered structure. We considered the effect of multireflection and the effect of interfaces (alloying effect). The effect of multi-reflection was studied by a calculation, and we found that the effect of multireflection was small. The Kerr rotation decreased with increasing period namely with decreasing interface layers. This result showed that the Kerr rotation of Pd/Co and Pt/Co multilayers caused mainly from interfaces.We also investigated the Kerr spectra of Ir/Co and Rh/Co multilayers, and it was found that these spectra resemble the Co spectrum.