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Thermal generation of spin current in epitaxial CoFe2O4 thin films

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arxiv 1509.03601 v1 pith:65JZM7EF submitted 2015-09-11 cond-mat.mtrl-sci

Thermal generation of spin current in epitaxial CoFe2O4 thin films

classification cond-mat.mtrl-sci
keywords spinfilmslssetemperatureeffectepitaxialcofe2o4investigated
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The longitudinal spin Seebeck effect (LSSE) has been investigated in high-quality epitaxial CoFe2O4 (CFO) thin films. The thermally excited spin currents in the CFO films are electrically detected in adjacent Pt layers due to the inverse spin Hall effect (ISHE). The LSSE signal exhibits a linear increase with increasing temperature gradient, yielding a LSSE coefficient of ~100 nV/K at room temperature. The temperature dependence of the LSSE is investigated from room temperature down to 30 K, showing a significant reduction at low temperatures, revealing that the total amount of thermally generated magnons decreases. Furthermore, we demonstrate that the spin Seebeck effect is an effective tool to study the magnetic anisotropy induced by epitaxial strain, especially in ultrathin films with low magnetic moments.

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