Thermal spin injection and accumulation in CoFe/MgO/n-type Ge contacts

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Understanding the interplay between spin and heat is a fundamental and intriguing subject. Here we report thermal spin injection and accumulation in CoFe/MgO/n-type Ge contacts with an asymmetry of tunnel spin polarization. Using local heating of electrodes by laser beam or electrical current, the thermally-induced spin accumulation is observed for both polarities of the temperature gradient across the tunnel contact. We observe that the magnitude of thermally injected spin signal scales linearly with the power of local heating of electrodes, and its sign is reversed as we invert the temperature gradient. A large Hanle magnetothermopower (HMTP) of about 7.0% and the Seebeck spin tunneling coefficient of larger than 0.74 meV K-1 are obtained at room temperature.
Publisher
NATURE PUBLISHING GROUP
Issue Date
2012-12
Language
English
Article Type
Article
Keywords

ROOM-TEMPERATURE; SILICON; SPINTRONICS; FERROMAGNET; MAGNETORESISTANCE; POLARIZATION; TRANSPORT

Citation

SCIENTIFIC REPORTS, v.2, pp.01 - 07

ISSN
2045-2322
DOI
10.1038/srep00962
URI
http://hdl.handle.net/10203/251245
Appears in Collection
RIMS Journal Papers
Files in This Item
000312331200001.pdf(1.28 MB)Download
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