Observation of the Spin-Seebeck Effect in a Ferromagnetic Semiconductor

Details Observation of the Spin-Seebeck Effect in a Ferromagnetic Semiconductor Observation of the Spin-Seebeck Effect in a Ferromagnetic Semiconductor

2010-07-08

arxiv.org/abs/1007.1364v1

Nature Materials 9, 898-903 (2010)

Physics

Condensed Matter

Materials Science

12 pages, 5 figures, plus supporting information 4 pages, 5 figures, 1 table

Scientific paper

10.1038/nmat2860

The spin-Seebeck effect was recently discovered in a metallic ferromagnet and consists of a thermally generated spin distribution that is electrically measured utilizing the inverse spin Hall effect. Here this effect is reproduced experimentally in a ferromagnetic semiconductor, GaMnAs, which allows for flexible design of the magnetization directions, a larger spin polarization, and measurements across the magnetic phase transition. The spin-Seebeck effect in GaMnAs is observed even in the absence of longitudinal charge transport. The spatial distribution of spin-currents is maintained across electrical breaks highlighting the local nature of the effect, which is therefore ascribed to a thermally induced spin redistribution.

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