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Dissipation due to pure spin current generated by spin pumping

Published

Author(s)

Wayne M. Saslow, Tomohiro Taniguchi

Abstract

Based on spin-dependent transport theory and thermodynamics, we develop a generalized theory of the Joule heating in the presence of a spin current. Along with the conventional Joule heating consisting of an electric current and electro-chemical potential, it is found that the spin current and spin accumulation give an additional dissipation because the spin-dependent scatterings inside bulk and ferromagnetic/nonmagnetic interface lead to a change of entropy. The theory is applied to investigate the dissipation due to pure spin current generated by spin pumping in a ferromagnetic/nonmagnetic/ferromagnetic multilayer. The dissipation arises from an interface because the spin pumping is a transfer of both the spin angular momentum and the energy from the ferromagnet to conduction electrons near the interface. It is found that the dissipation is proportional to the Gilbert damping constant enhanced by spin pumping.
Citation
Physical Review B
Volume
90
Issue
21

Keywords

Magnetic damping, spin current, Joule heating, magnetic multilayers, non-equilibrium thermodynamics, spin-transfer torque

Citation

Saslow, W. and Taniguchi, T. (2014), Dissipation due to pure spin current generated by spin pumping, Physical Review B, [online], https://doi.org/10.1103/PhysRevB.90.214407 (Accessed May 24, 2024)

Issues

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Created December 1, 2014, Updated November 10, 2018