Spin Pumping with Coherent Elastic Waves
Spin Pumping with Coherent Elastic Waves
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DOI：
10.1103/physrevlett.108.176601
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发表时间：
2012-04-23
影响因子：
8.6
通讯作者：
Goennenwein, S. T. B.
中科院分区：
文献类型：
--
作者：
Weiler, M.;Huebl, H.;Goennenwein, S. T. B.
我们证明了声子和磁子的共振耦合可以在室温下产生自旋流。频率为1.55 GHz、持续时间为300 ns的声表面波脉冲在铁磁薄膜-正常金属(Co/Pt)双层膜中产生相干弹性波。我们使用铂中的逆自旋霍尔电压作为自旋电流的量度，并记录其随时间、外加磁场大小和取向的变化。我们的实验表明，只有在共振弹性激发的情况下，才能产生自旋电流。这建立了声自旋泵浦作为自旋塞贝克效应的共振模拟。
We show that the resonant coupling of phonons and magnons can be exploited to generate spin currents at room temperature. Surface acoustic wave pulses with a frequency of 1.55 GHz and duration of 300 ns provide coherent elastic waves in a ferromagnetic thin-film-normal-metal (Co/Pt) bilayer. We use the inverse spin Hall voltage in the Pt as a measure for the spin current and record its evolution as a function of time and external magnetic field magnitude and orientation. Our experiments show that a spin current is generated in the exclusive presence of a resonant elastic excitation. This establishes acoustic spin pumping as a resonant analogue to the spin Seebeck effect.