TY - JOUR
T1 - Spin Seebeck coefficient enhancement by using Ta50W50 alloy and YIG/Ru interface
AU - Yuasa, Hiromi
AU - Nakata, Fumiya
AU - Nakamura, Ryohei
AU - Kurokawa, Yuichiro
N1 - Funding Information:
We would like to thank Prof. Fujigaya and the Nanotechnology Platform Programme (Molecule and Material Synthesis) of MEXT, Japan, for XPS analysis. This work was supported by the PRESTOJST (JPMJPR15R8), the Tateisi Science and Technology Foundation, the Spin Research Network of Japan and the JSPS KAKENHI (JP16K13617).
Publisher Copyright:
© 2018 IOP Publishing Ltd.
PY - 2018/3/7
Y1 - 2018/3/7
N2 - This paper reports that Ta50W50 alloy has a higher spin Hall angle than that of β-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.
AB - This paper reports that Ta50W50 alloy has a higher spin Hall angle than that of β-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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U2 - 10.1088/1361-6463/aaaf89
DO - 10.1088/1361-6463/aaaf89
M3 - Article
AN - SCOPUS:85044139027
SN - 0022-3727
VL - 51
JO - Journal Physics D: Applied Physics
JF - Journal Physics D: Applied Physics
IS - 13
M1 - 134002
ER -