6533b86dfe1ef96bd12caa0c

RESEARCH PRODUCT

Thermal generation of spin current in epitaxial CoFe2O4 thin films

Andreas HerklotzGerhard JakobJoel CramerAndreas KehlbergerMathias KläuiEr-jia GuoEr-jia Guo

subject

Condensed Matter - Materials ScienceMaterials sciencePhysics and Astronomy (miscellaneous)Condensed matter physicsMagnetic momentMagnonMaterials Science (cond-mat.mtrl-sci)FOS: Physical sciences02 engineering and technology021001 nanoscience & nanotechnology7. Clean energy01 natural sciencesMagnetic fieldMagnetic anisotropyCondensed Matter::Materials ScienceHall effectCondensed Matter::Superconductivity0103 physical sciencesThermoelectric effectSpin Hall effectThin film010306 general physics0210 nano-technology

description

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.

yearjournalcountryeditionlanguage
2016-01-11
10.1063/1.4939625http://arxiv.org/abs/1509.03601