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

Tomohiko Niizeki, Takashi Kikkawa, Ken Ichi Uchida, Mineto Oka, Kazuya Z. Suzuki, Hideto Yanagihara, Eiji Kita, Eiji Saitoh

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36 Citations (Scopus)


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. External-magnetic-field (H) dependence of the LSSE voltage (VLSSE) 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 1 0] shows a nearly closed loop, reflecting the different anisotropies induced by the epitaxial strain. The magnitude of VLSSE has a linear relationship with the temperature difference (ΔT), giving the relatively large VLSSE /ΔT of about 3 μV/K for CFO(110) which was kept even at zero external field.

Original languageEnglish
Article number053603
JournalAIP Advances
Issue number5
Publication statusPublished - 2015 May 1


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