Competing spin pumping effects in magnetic hybrid structures
Competing spin pumping effects in magnetic hybrid structures
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DOI：
10.1063/1.4863751
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发表时间：
2014-02
影响因子：
4
通讯作者：
A. Azevedo;O. A. Santos;Gabriel Andres Fonseca Guerra;R. Cunha;R. L. Rodríguez-Suárez;S. Rezende
中科院分区：
文献类型：
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作者：
A. Azevedo;O. A. Santos;Gabriel Andres Fonseca Guerra;R. Cunha;R. L. Rodríguez-Suárez;S. Rezende
在具有大的自旋-轨道耦合的纳米厚非磁性金属层中，利用逆自旋霍尔效应(ISHE)，通过将其转化为电荷电流，可以检测到纯自旋电流。最近，在纵向自旋Seebeck组态的温度梯度下，金属铁磁体坡莫合金(Py)在与绝缘铁磁体YIG(YIG)接触的Py层中产生电压的实验中，也被证明可以用作自旋电流探测器。在这里，我们报道了用单晶YIG薄膜和纳米厚的Py或Pt层构成的异质结中微波驱动自旋泵浦的实验，结果表明，Py作为自旋电流探测器的行为与非磁性金属不同。这一结果归因于YIG和Py的磁化动力学产生的自旋电流之间的竞争，这两个自旋电流在界面上交换耦合。
Pure spin current can be detected by its conversion into charge current in nanometer thick nonmagnetic metal layer with large spin-orbit coupling by means of the inverse spin Hall effect (ISHE). Recently, it has been shown that the metallic ferromagnet Permalloy (Py) can also be used as spin current detector in experiments in which an ISHE voltage is created in a Py layer in contact with the insulating ferromagnet yttrium iron garnet (YIG) under a thermal gradient in the longitudinal spin Seebeck configuration. Here, we report experiments with microwave driven spin pumping in heterostructures made with single crystal YIG film and a nanometer thick Py or Pt layer that show that Py behaves differently than nonmagnetic metals as a spin current detector. The results are attributed to the competition between the spin currents generated by the dynamics of the magnetizations in YIG and in Py, which are exchange coupled at the interface.