Thermal generation of spin current in epitaxial CoFe2O4 thin films

Er-Jia Guo; Andreas Herklotz; Andreas Kehlberger; Joel Cramer; Gerhard Jakob; Mathias Klaeui

doi:10.1063/1.4939625

Thermal generation of spin current in epitaxial CoFe2O4 thin films

Materials Science 2016-02-17 v1

Authors: Er-Jia Guo , Andreas Herklotz , Andreas Kehlberger , Joel Cramer , Gerhard Jakob , Mathias Klaeui

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Abstract

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.

Keywords

spin Seebeck effect CoFe2O4 thin films epitaxial strain magnetic anisotropy magnons inverse spin Hall effect

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@article{arxiv.1509.03601,
  title  = {Thermal generation of spin current in epitaxial CoFe2O4 thin films},
  author = {Er-Jia Guo and Andreas Herklotz and Andreas Kehlberger and Joel Cramer and Gerhard Jakob and Mathias Klaeui},
  journal= {arXiv preprint arXiv:1509.03601},
  year   = {2016}
}

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17 pages, 4 figures

Thermal generation of spin current in epitaxial CoFe2O4 thin films

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