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Observation of longitudinal spin-Seebeck effect in cobalt-ferrite epitaxial thin films

コバルトフェライトのエピタキシャル薄膜における縦型スピンゼーベック効果の観測

新関 智彦*; 吉川 貴史*; 内田 健一*; 岡 美嶺人*; 鈴木 和也*; 柳原 英人*; 喜多 英治*; 齊藤 英治

Niizeki, Tomohiko*; Kikkawa, Takashi*; Uchida, Kenichi*; Oka, Mineto*; Suzuki, Kazuya*; Yanagihara, Hideo*; Kita, Eiji*; Saito, Eiji

The longitudinal spin-Seebeck effect (LSSE) has been investigated in cobalt ferrite (CFO), an exceptionally hard magnetic spinel ferrite. A bilayer of a polycrystalline Pt and an epitaxially-strained CFO(110) exhibiting an in-plane uniaxial anisotropy was prepared by reactive rf sputtering technique. Thermally generated spin voltage in the CFO layer was measured via the inverse spin-Hall effect in the Pt layer. Externalmagnetic-field ($$H$$) dependence of the LSSE voltage ($$V_{LSSE}$$) in the Pt/CFO(110) sample with $$H |[001]$$ was found to exhibit a hysteresis loop with a high squareness ratio and high coercivity, while that with $$H |[1 overline{1} 0]$$ shows a nearly closed loop, reflecting the different anisotropies induced by the epitaxial strain. The magnitude of $$V_{LSSE}$$ has a linear relationship with the temperature difference ($$Delta T$$), giving the relatively large $$V_{LSSE}$$/$$Delta T$$ of about 3 $$mu$$V/K for CFO(110) which was kept even at zero external field.

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パーセンタイル:13.62

分野:Nanoscience & Nanotechnology

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