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

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

doi:10.1103/PhysRevB.94.024404

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

Materials Science 2016-07-13 v1 Mesoscale and Nanoscale Physics

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

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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 enhanced with decreasing temperature in line with the dominated surface transport at lower temperatures. The efficiency of the spin-electricity conversion is greater for TI samples with higher resistivity of bulk states and longer mean free path of surface states, consistent with the surface spin-electricity conversion.

Keywords

topological insulator surface state spin-electricity conversion spin pumping magnetic proximity effect universal scaling mean free path

Cite

@article{arxiv.1604.00751,
  title  = {Universal scaling for the spin-electricity conversion on surface states of topological insulators},
  author = {K. T. Yamamoto and Y. Shiomi and Kouji Segawa and Yoichi Ando and E. Saitoh},
  journal= {arXiv preprint arXiv:1604.00751},
  year   = {2016}
}

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

Abstract

Keywords

Cite

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