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Title: Thermal generation of spin current in epitaxial CoFe 2O 4 thin films

Abstract

The longitudinal spin Seebeck effect (LSSE) has been investigated in high-quality epitaxial CoFe 2O 4 (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. Moreover, 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.

Authors:
 [1];  [2];  [3];  [3];  [3];  [3]
  1. Johannes Gutenberg-Univ., Mainz (Germany); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Johannes Gutenberg-Univ., Mainz (Germany)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
German Research Foundation (DFG); European Union (EU); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1238752
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 108; Journal Issue: 2; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; magnetic films; magnetic fields; thermoelectric effects; ferrites; insulating thin films

Citation Formats

Guo, Er -Jia, Herklotz, Andreas, Kehlberger, Andreas, Cramer, Joel, Jakob, Gerhard, and Klaeui, Mathias. Thermal generation of spin current in epitaxial CoFe2O4 thin films. United States: N. p., 2016. Web. doi:10.1063/1.4939625.
Guo, Er -Jia, Herklotz, Andreas, Kehlberger, Andreas, Cramer, Joel, Jakob, Gerhard, & Klaeui, Mathias. Thermal generation of spin current in epitaxial CoFe2O4 thin films. United States. doi:10.1063/1.4939625.
Guo, Er -Jia, Herklotz, Andreas, Kehlberger, Andreas, Cramer, Joel, Jakob, Gerhard, and Klaeui, Mathias. Tue . "Thermal generation of spin current in epitaxial CoFe2O4 thin films". United States. doi:10.1063/1.4939625. https://www.osti.gov/servlets/purl/1238752.
@article{osti_1238752,
title = {Thermal generation of spin current in epitaxial CoFe2O4 thin films},
author = {Guo, Er -Jia and Herklotz, Andreas and Kehlberger, Andreas and Cramer, Joel and Jakob, Gerhard and Klaeui, Mathias},
abstractNote = {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. Moreover, 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.},
doi = {10.1063/1.4939625},
journal = {Applied Physics Letters},
number = 2,
volume = 108,
place = {United States},
year = {2016},
month = {1}
}

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