Spin heat accumulation and its relaxation in spin valves

Details Spin heat accumulation and its relaxation in spin valves Spin heat accumulation and its relaxation in spin valves

2009-10-26

arxiv.org/abs/0910.4867v2

Phys. Rev. B 81, 100408(R) (2010).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures, close to published version

Scientific paper

10.1103/PhysRevB.81.100408

We study the concept of spin heat accumulation in excited spin valves, more precisely the effective electron temperature that may become spin dependent, both in linear response and far from equilibrium. A temperature or voltage gradient create non-equilibrium energy distributions of the two spin ensembles in the normal metal spacer, which approach Fermi-Dirac functions through energy relaxation mediated by electron-electron and electron-phonon coupling. Both mechanisms also exchange energy between the spin subsystems. This inter-spin energy exchange may strongly affect thermoelectric properties spin valves, leading, e.g., to violations of the Wiedemann-Franz law.

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