Thermal spin injection and accumulation in CoFe/MgO/n-type Ge contacts
- Thermal spin injection and accumulation in CoFe/MgO/n-type Ge contacts
- 전건록; 민병철; 박승영; 이경동; 송현석; 박윤호; 신성철
- Issue Date
- Scientific Reports
- VOL 2, 962-1-962-7
- 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 largeHanlemagnetothermopower
(HMTP) of about 7.0% and the Seebeck spin tunneling coefficient of larger than 0.74 meV K21 are obtained
at room temperature.
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