Inverse spin Hall effect in structures based on yttrium iron garnet films with reduced saturation magnetization
Seleznev M. E.
1,2, S.L. Vysotskii
1,2, Amakhanov G. M.
3, Nikulin Y. V.
1,21Saratov Branch, Kotel’nikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences, Saratov, Russia
2Saratov State University, Saratov, Russia
3Yuri Gagarin State Technical University of Saratov, Saratov, Russia
Email: mixanich94@mail.ru, vysotsl@gmail.com, agm.05@yandex.ru, yvnikulin@gmail.com
The generation of EMF by the mechanism of the inverse spin Hall effect in platinum films deposited on the surface of yttrium iron garnet films with different values of saturation magnetization 4π M=1750-540 G was investigated due to the substitution of Fe ions by non-magnetic Ga and Sc ions. For the geometry of propagation of surface magnetostatic waves, the values of the efficiency of spin pumping E, defined as the ratio of the EMF to the power of the magnetostatic wave, were compared. At the bias field H greater than the saturation magnetization field Hs, the values of E are E 6.5-1.44·10-3 V/W in the structures based on films with 4π M=1750-850 G and 1.44-2.5·10-3 V/W for films with 4π M=565-540 G. It is shown that the parameter of doped films determining the efficiency of the ISHE in the structures based on them can be the nonuniform exchange constant α, with E~1/α. At H<Hs, the efficiency of spin pumping is inferior to the case of H>Hs by more than an order of magnitude and decreases with decreasing 4π M. Keywords: saturation magnetization, surface magnetostatic waves, inverse spin Hall effect.
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