Spin-Voltaic Effect and its Implications

Details Spin-Voltaic Effect and its Implications Spin-Voltaic Effect and its Implications

2003-04-22

arxiv.org/abs/cond-mat/0304472v1

Mater. Trans., JIM 44, 2062 (2003)

Physics

Condensed Matter

4 pages, 2 figures; submitted to Materials Transactions, special issue on Nano-Hetero Structures in Advanced Metallic Material

Scientific paper

In an inhomogeneously doped magnetic semiconductor, an interplay between an equilibrium magnetization and injected nonequilibrium spin leads to the spin-voltaic effect--a spin analogue of the photo-voltaic effect. By reversing either the sign of the equilibrium magnetization or the direction of injected spin polarization it is possible to switch the direction of charge current in a closed circuit or, alternatively, to switch the sign of the induced open-circuit voltage. Properties of the spin-voltaic effect can be used to perform all-electrical measurements of spin relaxation time and injected spin polarization, as well as to design devices with large magnetoresistance and spin-controlled amplification.

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