Universal scaling for the spin-electricity conversion on surface states of topological insulators

K. T. Yamamoto, Y. Shiomi, Kouji Segawa, Yoichi Ando, E. Saitoh

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

We have investigated spin-electricity conversion on surface states of bulk-insulating topological insulator (TI) materials using a spin-pumping technique. The sample structure is Ni-Fe Cu TI trilayers, in which magnetic proximity effects on the TI surfaces are negligibly small owing to the inserted Cu layer. Voltage signals produced by the spin-electricity conversion are clearly observed and are enhanced with decreasing temperature, in line with the dominant surface transport at lower temperatures. The efficiency of the spin-electricity conversion is greater for TI samples with a higher resistivity of bulk states and longer mean free path of surface states, consistent with the surface spin-electricity conversion.

Original languageEnglish
Article number024404
JournalPhysical Review B
Volume94
Issue number2
DOIs
Publication statusPublished - 2016 Jul 5

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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