Universität zu Köln

Yamamoto, K. T., Shiomi, Y., Segawa, Kouji, Ando, Yoichi ORCID: 0000-0002-3553-3355 and Saitoh, E. (2016). Universal scaling for the spin-electricity conversion on surface states of topological insulators. Phys. Rev. B, 94 (2). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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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 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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Yamamoto, K. T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Shiomi, Y. UNSPECIFIED UNSPECIFIED UNSPECIFIED Segawa, Kouji UNSPECIFIED UNSPECIFIED UNSPECIFIED Ando, Yoichi UNSPECIFIED orcid.org/0000-0002-3553-3355 UNSPECIFIED Saitoh, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-270142
DOI:	10.1103/PhysRevB.94.024404
Journal or Publication Title:	Phys. Rev. B
Volume:	94
Number:	2
Date:	2016
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9969
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics II
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language TORQUE Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/27014