Weak temperature and bias dependence of spin accumulation in epitaxial Co70Fe30/MgO tunnel contacts to p-type Ge

Title
Weak temperature and bias dependence of spin accumulation in epitaxial Co70Fe30/MgO tunnel contacts to p-type Ge
Authors
민병철전건록박승영
Issue Date
2017-09
Publisher
Japanese Journal of Applied Physics, Part 1- Regular Papers
Citation
VOL 56, NO 9-090303-4
Abstract
Electrical spin accumulation that was robust against changes in temperature and bias voltage was achieved in epitaxial Co70Fe30/MgO tunnel contacts to p-type Ge, with negligible Schottky barrier formation. Hanle and inverted Hanle effects, which are characteristic features of nonequilibrium spin accumulation in the tunnel contacts, were clearly observed up to room temperature for both hole spin injection and extraction. Notably, the obtained spin signal showed weak temperature dependence even at a low bias voltage, and symmetric behavior with respect to bias polarity, which are inconsistent with spin-polarized tunneling via localized states in the contact.
URI
http://pubs.kist.re.kr/handle/201004/66038
ISSN
0021-4922
Appears in Collections:
KIST Publication > Article
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