体心立方构型三层磁性体系的自旋波行为研究

Spin wave behavior of three-layer magnetic system with body-centered cubic configuration

为了解体心立方构型磁性薄膜的自旋波行为,在海森堡模型的框架下,构建具有4个子格体心结构的三层磁性系统,该系统内部符合亚铁磁构型。利用线性自旋波理论和推迟格林函数的方法求解系统的哈密顿量,通过谱定理计算得到自旋波谱。基于控制变量法,研究各物理参量对系统能隙和共振频率的影响。研究结果表明:层间各向异性对系统能隙和共振频率都存在相对较小的影响,而自旋量子数和交换耦合作用对系统中个别几条能隙和共振频率影响显著。研究结论为相关自旋电子器件的优化提供理论参考。

In order to understand the spin wave behavior of magnetic thin films with cubic configuration,a three-layer magnetic system with four lattices body-centered structure was constructed under the framework of Heisenberg model.This paper uses linear spin wave theory and delayed Green's function to solve the Hamiltonian of the system,and the spin spectrum is obtained by spectral theorem.The effects of physical parameters on the energy gap and resonance frequency of the system are studied based on the control variable method.The results show that the interlayer anisotropy has relatively small effects on the band gaps and resonant frequencies of the system,while spin quantum number and exchange coupling have significant effects on the individual band gaps and resonant frequencies of the system.The research conclusions provide a theoretical reference for the optimization of related spintronic devices.