Spin Pumping by Higher-Order Dipole-Exchange Spin-Wave Modes
Spin Pumping by Higher-Order Dipole-Exchange Spin-Wave Modes
复制标题
高阶偶极子交换自旋波模式的自旋泵浦
DOI：
10.1088/1674-1056/ac8922
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发表时间：
2022-08
影响因子：
1.7
通讯作者：
Peng Wang
中科院分区：
文献类型：
--
作者：
Peng Wang
本文系统地研究了钇铁石榴石薄膜中参变激发的偶极交换自旋波驱动的自旋泵浦（SP）和逆自旋霍尔效应（ISHE）。由于非均匀激发几何结构，测量的电压谱呈现出从平行泵浦到垂直泵浦的场致跃迁特征。由于SP-ISHE探测的高精度，在电压谱中观察到两组精细结构，它们可以很好地对应于磁性薄膜多模自旋波谱中的两种临界点。一个是每个高阶色散分支的q = 0点，另一个是由于偶极和交换相互作用之间的相互作用而导致的局部最小值。电压谱上的精细结构证实了高阶偶极交换自旋波模的自旋抽运，有助于探测多模自旋波谱。
Abstract Spin pumping (SP) and inverse spin Hall effect (ISHE) driven by parametrically-excited dipole-exchange spin waves in a yttrium iron garnet film have been systematically investigated. The measured voltage spectrum exhibits a feature of the field-induced transition from parallel pumping to perpendicular pumping because of the inhomogeneous excitation geometry. Thanks to the high precision of the SP-ISHE detection, two sets of fine structures in the voltage spectrum are observed, which can correspond well to two kinds of critical points in the multimode spin-wave spectrum for magnetic films. One is the q = 0 point of each higher-order dispersion branch, and the other is the local minimum due to the interplay between the dipolar and exchange interactions. These fine structures on the voltage spectrum confirm the spin pumping by higher-order dipole-exchange spin-wave modes, and are helpful for probing the multimode spin-wave spectrum.