Linear-response theory of the longitudinal spin Seebeck effect

Abstract

We theoretically investigate the longitudinal spin Seebeck effect, in which the spin current is injected from a ferromagnet into an attached nonmagnetic metal in a direction parallel to the temperature gradient. Using the fact that the phonon heat current flows intensely into the attached nonmagnetic metal in this particular configuration, we show that the sign of the spin injection signal in the longitudinal spin Seebeck effect can be opposite to that in the conventional transverse spin Seebeck effect when the electron-phonon interaction in the nonmagnetic metal is sufficiently large. Our linear-response approach can explain the sign reversal of the spin injection signal recently observed in the longitudinal spin Seebeck effect.

Proc. of ICM 2012 (Accepted for publication in J. Korean Phys. Soc.), typos corrected

References in corpus (3)

• Spin Seebeck insulator
• Observation of the Spin-Seebeck Effect in a Ferromagnetic Semiconductor
• Theory of magnon-driven spin Seebeck effect

Cited by in corpus (6)

• Theory of the Spin Seebeck Effect
• Quantitative Temperature Dependence of Longitudinal Spin Seebeck Effect at High Temperatures
• Thermographic measurements of the spin Peltier effect in metal/yttrium-iron-garnet junction systems
• Edge magnetization and spin transport in an SU(2)-symmetric Kitaev spin liquid
• Thermal spin current and spin accumulation at ferromagnetic insulator/nonmagnetic metal interface
• Magnon instability driven by heat current in magnetic bilayers