Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.
J Phys Condens Matter. 2010 May 12;22(18):186002. doi: 10.1088/0953-8984/22/18/186002. Epub 2010 Apr 15.
We examine the spin-wave (SW) dynamics of Dy/Y multilayers in order to separate the contribution of the Dy-Y interface from that of bulk Dy. The SW frequencies and intensities of bulk Dy are determined analytically. When the Dy layers in a multilayer geometry are decoupled, the SW dispersion relations are discontinuous with discrete excitations. With a Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction coupling through the Y spacer, the discrete excitations become dispersive and the main SW branches split due to the multilayer geometry. Regardless of the strength of the intermediate RKKY interaction, the dispersion signature of the bulk remains.
我们研究了 Dy/Y 多层膜的自旋波（SW）动力学，以分离 Dy-Y 界面的贡献和体 Dy 的贡献。体 Dy 的 SW 频率和强度通过解析确定。当多层结构中的 Dy 层解耦时，SW 色散关系是不连续的，有离散激发。通过 Y 间隔物的 Ruderman-Kittel-Kasuya-Yosida（RKKY）相互作用耦合，离散激发变得色散，并且由于多层结构，主要 SW 分支分裂。无论中间 RKKY 相互作用的强度如何，体的色散特征仍然存在。
