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Spin-relaxation modulation and spin-pumping control by transverse spin-wave spin current in Y$$_3$$Fe$$_5$$O$$_{12}$$

Kajiwara, Yosuke*; Uchida, Kenichi*; Kikuchi, Daisuke*; An, Toshu*; Fujikawa, Yasunori*; Saito, Eiji

Heat-current-induced manipulation of spin relaxation in Y$$_3$$Fe$$_5$$O$$_{12}$$ 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 Y$$_3$$Fe$$_5$$O$$_{12}$$ 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 Y$$_3$$Fe$$_5$$O$$_{12}$$ 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.

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Category:Physics, Applied

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