论文标题

强旋轨属中的声旋霍尔效应

Acoustic spin Hall effect in strong spin-orbit metals

论文作者

Kawada, Takuya, Kawaguchi, Masashi, Funato, Takumi, Kohno, Hiroshi, Hayashi, Masamitsu

论文摘要

我们报告了观察到旋转旋转效果的观察,该效果通过旋转轨道相互作用(SOI)促进了晶格运动诱导的旋转电流。在表面声波的激发下(SAW),我们发现了与非磁性金属中表面声波(SAW)的传播方向正交的旋转电流流动。声自旋霍尔的效应在非磁性金属(NM)/铁磁金属(FM)双层中的田间依赖性声电压中表现出来。当NM层厚度接近其自旋扩散长度时,声电压的最大值将消失,而NM层的SOI较弱,并且随锯频率线性增加。为了考虑这些结果,我们发现自旋电流必须通过SOI和晶格位移的时间导数进行扩展。这种自旋电流的形式可以源自与时间变化的浆果曲率和/或由SOI介导的非常规的自旋晶格相互作用相关的浆果电场。这些结果暗示了通过SOI旋转电子自旋与旋转晶格的强耦合,显示了晶格动力学在强旋转轨道金属中提供旋转电流的潜力。

We report on the observation of the acoustic spin Hall effect that facilitates lattice motion induced spin current via spin orbit interaction (SOI). Under excitation of surface acoustic wave (SAW), we find a spin current flows orthogonal to the propagation direction of a surface acoustic wave (SAW) in non-magnetic metals. The acoustic spin Hall effect manifests itself in a field-dependent acoustic voltage in non-magnetic metal (NM)/ferromagnetic metal (FM) bilayers. The acoustic voltage takes a maximum when the NM layer thickness is close to its spin diffusion length, vanishes for NM layers with weak SOI and increases linearly with the SAW frequency. To account for these results, we find the spin current must scale with the SOI and the time derivative of the lattice displacement. Such form of spin current can be derived from a Berry electric field associated with time varying Berry curvature and/or an unconventional spin-lattice interaction mediated by SOI. These results, which imply the strong coupling of electron spins with rotating lattices via the SOI, show the potential of lattice dynamics to supply spin current in strong spin orbit metals.

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