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Dissipation due to pure spin current generated by spin pumping



Wayne M. Saslow, Tomohiro Taniguchi


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.
Physical Review B


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


Saslow, W. and Taniguchi, T. (2014), Dissipation due to pure spin current generated by spin pumping, Physical Review B, [online], (Accessed May 24, 2024)


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Created December 1, 2014, Updated November 10, 2018