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 linea...

Full description

Saved in:
Bibliographic Details
Published in:Applied physics letters 2016-01, Vol.108 (2)
Main Authors: Guo, Er-Jia, Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, Herklotz, Andreas, Kehlberger, Andreas, Cramer, Joel, Jakob, Gerhard, Kläui, Mathias
Format: Article
Language:English
Subjects:
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
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:0003-6951
1077-3118