TY - JOUR
T1 - Impact of oxygen interdiffusion on spin-to-charge conversion at nonmagnetic metal/Bi oxide interfaces
AU - Sugimoto, S.
AU - Uzuhashi, J.
AU - Isogami, S.
AU - Ohkubo, T.
AU - Takahashi, Y. K.
AU - Kasai, S.
AU - Hono, K.
N1 - Funding Information:
This work was partially supported by the Japan Society for the Promotion of Science, KAKENHI Grant No. 17K18892, and JST, PRESTO Grant No. JPMJPR18L3, Japan.
Publisher Copyright:
©2019 American Physical Society.
PY - 2019/10/14
Y1 - 2019/10/14
N2 - Spin-to-charge conversion at metal/oxide interfaces with stacked structures of permalloy/(Cu or Ag)/Bi2O3 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)/Bi2O3 was found to change depending on the crystalline orientation of the Cu or Ag underlayer. While the Ag/Bi2O3 stacks with Ag(111) had steep interfaces, the formation of a nanometer-scale Cu-O layer can be found in the Cu/Bi2O3 interface, which should be the main origin of the sign inversion of the conversion coefficients between Cu/Bi2O3 and Ag/Bi2O3. This study stresses the importance of nanostructure identification for discussing spin-to-charge conversions at metal/oxide interfaces.
AB - Spin-to-charge conversion at metal/oxide interfaces with stacked structures of permalloy/(Cu or Ag)/Bi2O3 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)/Bi2O3 was found to change depending on the crystalline orientation of the Cu or Ag underlayer. While the Ag/Bi2O3 stacks with Ag(111) had steep interfaces, the formation of a nanometer-scale Cu-O layer can be found in the Cu/Bi2O3 interface, which should be the main origin of the sign inversion of the conversion coefficients between Cu/Bi2O3 and Ag/Bi2O3. This study stresses the importance of nanostructure identification for discussing spin-to-charge conversions at metal/oxide interfaces.
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U2 - 10.1103/PhysRevMaterials.3.104410
DO - 10.1103/PhysRevMaterials.3.104410
M3 - Article
AN - SCOPUS:85074394974
SN - 2475-9953
VL - 3
JO - Physical Review Materials
JF - Physical Review Materials
IS - 10
M1 - 104410
ER -