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Spin Seebeck effect in the layered ferromagnetic insulators CrSiTe$$_3$$ and CrGeTe$$_3$$

積層強磁性絶縁体CrSiTe$$_3$$ and CrGeTe$$_3$$におけるスピンゼーベック効果

伊東 直洋*; 吉川 貴史*; Barker, J.*; 廣部 大地*; 塩見 雄毅*; 齊藤 英治

Ito, Naohiro*; Kikkawa, Takashi*; Barker, J.*; Hirobe, Daichi*; Shiomi, Yuki*; Saito, Eiji

We have studied the longitudinal spin Seebeck effect (LSSE) in the layered ferromagnetic insulators CrSiTe$$_3$$ and CrGeTe$$_3$$ covered by Pt films in the measurement configuration where spin current traverses the ferromagnetic Cr layers. The LSSE response is clearly observed in the ferromagnetic phase and, in contrast to a standard LSSE magnet Y$$_3$$Fe$$_5$$O$$_{12}$$, persists above the critical temperatures in both CrSiTe$$_3$$/Pt and CrGeTe$$_3$$/Pt samples. With the help of a numerical calculation, we attribute the LSSE signals observed in the paramagnetic regime to exchange-dominated interlayer transport of in-plane paramagnetic moments reinforced by short-range ferromagnetic correlations and strong Zeeman effects.

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パーセンタイル:89.29

分野:Materials Science, Multidisciplinary

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