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

Journal Article · Mon Jan 11 00:00:00 EST 2016 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4939625· OSTI ID:22489290

Guo, Er-Jia ^[1]; Herklotz, Andreas ^[2]; Kehlberger, Andreas; Cramer, Joel; Jakob, Gerhard; Kläui, Mathias ^[1]

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1. Institut für Physik, Johannes Gutenberg-Universität Mainz, 55099 Mainz (Germany)
2. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830 (United States)

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.

• OSTI ID: 22489290
• Journal Information: Applied Physics Letters, Vol. 108, Issue 2; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

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