Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 51, Issue 13, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6463/aaaf89
Keywords
spin Seebeck effect; spin Hall angle; spin mixing conduntance
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Funding
- PRESTO-JST [JPMJPR15R8]
- Tateisi Science and Technology Foundation
- Spin Research Network of Japan
- JSPS KAKENHI [JP16K13617]
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This paper reports that Ta50W50 alloy has a higher spin Hall angle than that of beta-W by measuring the spin Seebeck coefficients for Fe5Y3O12 (YIG)/Ru/Ta50W50 and YIG/Ru/W systems. The spin Seebeck coefficient increased by inserting Ru, and the YIG/Ru/Ta50W50 system achieved 2.4 times the magnitude of spin Seebeck coefficient of the conventional YIG/Pt system although Ru and Ta50W50 have spin Hall angles with opposite signs. Ru seems to recover the spin mixing conductance that is decreased by Ta-W oxidation at its interface with YIG. To enhance the spin Seebeck coefficient, materials having a high spin Hall angle can be combined with materials having a high spin mixing conductance.
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