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

The longitudinal spin Seebeck effect (LSSE) has been investigated in high-quality epitaxial CoFe{sub 2}O{sub 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. 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.
Authors:
 [1] ;  [2] ;  [3] ; ; ; ;  [1]
  1. Institut für Physik, Johannes Gutenberg-Universität Mainz, 55099 Mainz (Germany)
  2. (United States)
  3. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830 (United States)
Publication Date:
OSTI Identifier:
22489290
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 108; Journal Issue: 2; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COBALT OXIDES; EPITAXY; HALL EFFECT; LAYERS; MAGNETIC MOMENTS; MAGNONS; SEEBECK EFFECT; SIGNALS; SPIN; STRAINS; TEMPERATURE DEPENDENCE; TEMPERATURE GRADIENTS; THIN FILMS