Impact of oxygen interdiffusion on spin-to-charge conversion at nonmagnetic metal/Bi oxide interfaces

S. Sugimoto, J. Uzuhashi, S. Isogami, T. Ohkubo, Y. K. Takahashi, S. Kasai, K. Hono

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

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.

Original languageEnglish
Article number104410
JournalPhysical Review Materials
Volume3
Issue number10
DOIs
Publication statusPublished - 2019 Oct 14
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy (miscellaneous)

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