Spin-filter devices based on resonant tunneling antisymmetrical magnetic/semiconductor hybrid structures

Xu, H.Z.; Yafei Zhang
March 2004
Applied Physics Letters;3/15/2004, Vol. 84 Issue 11, p1955
Academic Journal
Spin filter devices based on resonant tunneling antisymmetrical magnetic-barrier structures are proposed and the spin-polarization properties are described. These devices can be realized by depositing one or two ferromagnetic stripes with perpendicular magnetization on top of two-dimensional electron gas. It is remarkable that the spin-filter efficiency of the transmission probability and the conductance through these devices could be reached completely (∼100%) in resonance, and that constant voltage applied to the metallic stripe of the systems could tune the spin polarization. These interesting features may lead to a practical voltage controlled spin filter. © 2004 American Institute of Physics.


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