Temperature dependence of spin injection efficiency in an epitaxially grown Fe/GaAs hybrid structure

Title
Temperature dependence of spin injection efficiency in an epitaxially grown Fe/GaAs hybrid structure
Authors
이태환구현철김경호김형준장준연한석희홍진기임상호
Keywords
Spin injection; Spin injection efficiency; Interface resistance; Schottky-tunnel-barrier
Issue Date
2009-11
Publisher
Journal of magnetism and magnetic materials
Citation
VOL 321, NO 22, 3795-3798
Abstract
The electrical spin injection from Fe into an n-doped GaAs channel through Schottky-tunnel-barrier is observed from 1.8 K to room temperature. The magnitude of local spin valve signal (ΔR/R0) decreases as the temperature increases. In each temperature, we calculated the injected polarization (η) considering the spin drift effect induced by the electric field. The interfacial polarizations of 19.3% and 12.6% are acquired for Fe/GaAs junction at T=1.8 and 300 K, respectively. The temperature dependence of spin injection efficiency is matched with interface resistance variation. As the temperature increases, Schottky-tunnel-barrier property is diminished so that the spin injection efficiency would be reduced.
URI
http://pubs.kist.re.kr/handle/201004/35809
ISSN
0304-8853
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KIST Publication > Article
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