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

Tomohiko Niizeki | Zendy; Takashi Kikkawa | Zendy; Kenichi Uchida | Zendy; Mineto Oka | Zendy; Kazuya Suzuki | Zendy; Hideto Yanagihara | Zendy; Eiji Kita | Zendy; Eiji Saitoh | Zendy

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

Author(s) -

Tomohiko Niizeki,

Takashi Kikkawa,

Kenichi Uchida,

Mineto Oka,

Kazuya Suzuki,

Hideto Yanagihara,

Eiji Kita,

Eiji Saitoh

Publication year - 2015

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.4916978

Subject(s) - condensed matter physics , materials science , coercivity , epitaxy , magnetic hysteresis , ferromagnetism , seebeck coefficient , hysteresis , ferrite (magnet) , thin film , thermoelectric effect , magnetization , magnetic field , layer (electronics) , nanotechnology , thermal conductivity , physics , composite material , quantum mechanics , thermodynamics

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∥[11̄0]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

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