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.
Published in Physical Review B, ed. Gene D. Sprouse, Volume 75, Issue 19, 2007, pages 193301-1-193301-4.
Pershin, Y. V., & Di Ventra, M. (2007). Spin blockade at semiconductor/ferromagnet junctions. Physical Review B, 75(19), 193301-1 - 193301-4. DOI: 10.1103/PhysRevB.75.193301
© Physical Review B, 2007, American Physical Society