Spin blockade at semiconductor/ferromagnet junctions

Details Spin blockade at semiconductor/ferromagnet junctions Spin blockade at semiconductor/ferromagnet junctions

2007-01-27

arxiv.org/abs/cond-mat/0701678v2

Phys. Rev. B 75, 193301 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

to be published in PRB

Scientific paper

10.1103/PhysRevB.75.193301

We study theoretically extraction of spin-polarized electrons at nonmagnetic semiconductor/ferromagnet junctions. The outflow of majority spin electrons from the semiconductor into the ferromagnet leaves a cloud of minority spin electrons in the semiconductor region near the junction, forming a local spin-dipole configuration at the semiconductor/ferromagnet interface. This minority spin cloud can limit the majority spin current through the junction creating a pronounced spin-blockade at a critical current. We calculate the critical spin-blockade current in both planar and cylindrical geometries and discuss possible experimental tests of our predictions.

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