Spin-wave modes in permalloy/platinum wires and tuning of the mode damping by spin Hall current
Spin-wave modes in permalloy/platinum wires and tuning of the mode damping by spin Hall current
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DOI：
10.1103/physrevb.90.024427
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发表时间：
2014-07-28
影响因子：
3.7
通讯作者：
Lindner, Juergen
中科院分区：
文献类型：
--
作者：
Duan, Zheng;Boone, Carl T.;Lindner, Juergen
我们报告了沿两个主面内轴磁化的坡莫合金/铂（Py/Pt）双层线中自旋波模式的光谱特性的测量。我们发现，Pt 中自旋霍尔电流产生的自旋扭矩可以显着减小垂直于其长轴磁化的线的体自旋波模式和边缘自旋波模式的谱线宽度。准均匀模式的线宽减小最强，而边缘模式的线宽减小最弱。我们的工作证明了自旋波阻尼的外在贡献对于通过自旋霍尔电流调整磁化动力学的重要性。
We report measurements of spectral properties of spin-wave modes in permalloy/platinum (Py/Pt) bilayer wires magnetized along two principal in-plane axes. We find that the spin torque arising from the spin Hall current in Pt can significantly reduce the spectral linewidth of the bulk and edge spin-wave modes of the wire magnetized perpendicular to its long axis. The linewidth reduction is strongest for the quasiuniform mode and weakest for the edge mode. Our work demonstrates the importance of extrinsic contributions to spin-wave damping for tuning of magnetization dynamics by spin Hall current.