Non-local detection of spin-polarized electrons at room temperature in Co50Fe50/GaAs Schottky tunnel junctions

Uemura, Tetsuya; Akiho, Takafumi; Harada, Masanobu; Matsuda, Ken-ichi; Yamamoto, Masafumi

doi:10.1063/1.3630032


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Non-local detection of spin-polarized electrons at room temperature in Co50Fe50/GaAs Schottky tunnel junctions

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Title:	Non-local detection of spin-polarized electrons at room temperature in Co50Fe50/GaAs Schottky tunnel junctions
Authors:	Uemura, Tetsuya Browse this author →KAKEN DB
	Akiho, Takafumi Browse this author
	Harada, Masanobu Browse this author
	Matsuda, Ken-ichi Browse this author
	Yamamoto, Masafumi Browse this author
Keywords:	cobalt alloys
	gallium arsenide
	Hanle effect
	III-V semiconductors
	iron alloys
	Schottky barriers
	semiconductor-metal boundaries
	spin polarised transport
	spin valves
Issue Date:	22-Aug-2011
Publisher:	American Institute of Physics
Journal Title:	Applied Physics Letters
Volume:	99
Issue:	8
Start Page:	082108
Publisher DOI:	10.1063/1.3630032
Abstract:	A clear spin-valve signal and a Hanle signal were observed in a Co50Fe50/n-GaAs Schottky tunnel junction through a four-terminal non-local geometry. The sign and magnitude of the spin-valve signal were strongly dependent on the bias current, suggesting that the spin polarization at the Co50Fe50/n-GaAs interface had strong energy dependence. A clear spin-valve signal was observed at temperatures up to 290 K. The magnitude of the spin-valve signal monotonically decreased by a factor of 7.9 as the temperature increased from 10 K to 290 K; this factor was significantly smaller than the factors reported for Fe/n-GaAs junctions which range from 35 to 80.
Rights:	Copyright 2011 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Appl. Phys. Lett. 99, 082108 (2011) and may be found at https://dx.doi.org/10.1063/1.3630032
Type:	article
URI:	http://hdl.handle.net/2115/47133
Appears in Collections:	情報科学院・情報科学研究院 (Graduate School of Information Science and Technology / Faculty of Information Science and Technology) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 植村哲也

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