Impact of oxygen interdiffusion on spin-to-charge conversion at nonmagnetic metal/Bi oxide interfaces
Impact of oxygen interdiffusion on spin-to-charge conversion at nonmagnetic metal/Bi oxide interfaces
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DOI：
10.1103/physrevmaterials.3.104410
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发表时间：
2019-10
影响因子：
3.4
通讯作者：
S. Sugimoto;Jun Uzuhashi;S. Isogami;T. Ohkubo;Y. Takahashi;S. Kasai;K. Hono
中科院分区：
文献类型：
--
作者：
S. Sugimoto;Jun Uzuhashi;S. Isogami;T. Ohkubo;Y. Takahashi;S. Kasai;K. Hono
利用自旋抽运技术和截面透射电子显微镜系统地研究了坡莫合金/（Cu或Ag）/叠层结构金属/氧化物界面的自旋-电荷转换。虽然运输测量再现了在以前的研究中的结果，（Cu或Ag）/的界面结构被发现改变取决于Cu或Ag底层的结晶取向。而Ag/（111）叠层具有陡峭的界面，在Cu/界面处可以发现纳米尺度的Cu-O层的形成，这应该是Cu/和Ag/之间转换系数符号反转的主要原因。这项研究强调了纳米结构识别的重要性，讨论在金属/氧化物界面的自旋电荷转换。
Spin-to-charge conversion at metal/oxide interfaces with stacked structures of permalloy/(Cu or Ag)/were systematically investigated by using the spin-pumping technique and cross-sectional transmission electron microscopy. Although the transport measurement reproduced the results in previous studies, the interfacial structure of (Cu or Ag)/was found to change depending on the crystalline orientation of the Cu or Ag underlayer. While the Ag/stacks with Ag(111) had steep interfaces, the formation of a nanometer-scale Cu-O layer can be found in the Cu/interface, which should be the main origin of the sign inversion of the conversion coefficients between Cu/and Ag/. This study stresses the importance of nanostructure identification for discussing spin-to-charge conversions at metal/oxide interfaces.