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Longitudinal spin Seebeck effect in various garnet ferrites

種々のガーネットフェライト中での縦スピンゼーベック効果

内田 健一*; 野中 挙海*; 吉川 貴史*; 梶原 瑛祐*; 齊藤 英治

Uchida, Kenichi*; Nonaka, Tatsumi*; Kikkawa, Takashi*; Kajiwara, Yosuke*; Saito, Eiji

種々のガーネットフェライトY$$_{3-x}$$$$R$$$$_{x}$$Fe$$_{5-y}$$$$M$$$$_{y}$$O$$_{12}$$($$R$$=Gd, Ca; $$M$$=Al, Mn, V, In, Zr)の縦スピンゼーベック効果(LSSE)をPt中の逆スピンホール効果を用いて調べた。Pt/Y$$_{3-x}$$$$R$$$$_{x}$$Fe$$_{5-y}$$$$M$$$$_{y}$$O$$_{12}$$試料中のLSSE電圧はガーネットフェライト中のFeの濃度を上げると増大することが分かった。これは、Pt/Y$$_{3-x}$$$$R$$$$_{x}$$Fe$$_{5-y}$$$$M$$$$_{y}$$O$$_{12}$$界面でのスピンミキシングコンダクタンスの変化で説明できる。また、我々はLSSE電圧とY$$_{3-x}$$$$R$$$$_{x}$$Fe$$_{5-y}$$$$M$$$$_{y}$$O$$_{12}$$の局所的な磁性パラメーターとの相関についても調べた。この実験結果はPt/Y$$_{3-x}$$$$R$$$$_{x}$$Fe$$_{5-y}$$$$M$$$$_{y}$$O$$_{12}$$試料中のLSSE電圧はキュリー温度および飽和磁化に正の相関があるが、磁気回転比とギルバートダンピング定数との有意な相関は無いことを示している。

The longitudinal spin Seebeck effect (LSSE) is investigated in various garnet ferritesY$$_{3-x}$$$$R$$$$_{x}$$Fe$$_{5-y}$$$$M$$$$_{y}$$O$$_{12}$$ ($$R$$ = Gd, Ca; $$M$$ = Al, Mn, V, In, Zr) by means of the inverse spin Hall effect in Pt films. The magnitude of the LSSE voltage in the Pt/Y$$_{3-x}$$$$R$$$$_{x}$$Fe$$_{5-y}$$$$M$$$$_{y}$$O$$_{12}$$ samples is found to be enhanced with increasing concentration of Fe in the garnet ferrites, which can be explained by a change in the spin-mixing conductance at the Pt/Y$$_{3-x}$$$$R$$$$_{x}$$Fe$$_{5-y}$$$$M$$$$_{y}$$O$$_{12}$$ interfaces. We also investigate the dependence of the LSSE voltage on macroscopic magnetic parameters of Y$$_{3-x}$$$$R$$$$_{x}$$Fe$$_{5-y}$$$$M$$$$_{y}$$O$$_{12}$$. The experimental results show that the LSSE voltage in the Pt/Y$$_{3-x}$$$$R$$$$_{x}$$Fe$$_{5-y}$$$$M$$$$_{y}$$O$$_{12}$$ samples hasa positive correlation with the Curie temperature and the saturation magnetization, but no clear correlation with the gyromagnetic ratio and the Gilbert damping constant of the samples.

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パーセンタイル:94.96

分野:Materials Science, Multidisciplinary

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