Heat-current-induced manipulation of spin relaxation in Y3Fe5O12 under an in-plane temperature gradient is investigated. We show that the linewidth of the ferromagnetic resonance spectrum, i.e., the spin relaxation, in an Y3Fe5O12 film increases or decreases depending on the temperature-gradient direction and that this modulation is attributed to the spin-transfer torque caused by a thermally induced transverse spin-wave spin current in the Y3Fe5O12 film. The experimental results also show that the spin-current magnitude generated by spin pumping in an attached Pt film is inversely proportional to the square of the modulated Gilbert damping constant, consistent with a phenomenological spin-pumping model.
Spin-relaxation modulation and spin-pumping control by transverse spin-wave spin current in Y3Fe5O12
Y. Kajiwara, K. Uchida, D. Kikuchi, T. An, Y. Fujikawa, E. Saitoh; Spin-relaxation modulation and spin-pumping control by transverse spin-wave spin current in Y3Fe5O12. Appl. Phys. Lett. 29 July 2013; 103 (5): 052404. https://doi.org/10.1063/1.4817076
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