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Spin filtering and magnetoresistance in ballistic tunnel junctions

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arxiv cond-mat/0103442 v2 pith:HO6KNONK submitted 2001-03-21 cond-mat.mes-hall

J.C. Egues , C. Gould , G. Richter , L. W. Molenkamp This is my paper · ORCID
classification cond-mat.mes-hall
keywords filteringsemimagneticspinbarriersjunctionsmagnetoresistancetunnelballistic
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We theoretically investigate magnetoresistance (MR) effects in connection with spin filtering in quantum-coherent transport through tunnel junctions based on non-magnetic/semimagnetic heterostructures. We find that spin filtering in conjunction with the suppression/enhancement of the spin-dependent Fermi seas in semimagnetic contacts gives rise to (i) spin-split kinks in the MR of single barriers and (ii) a robust beating pattern in the MR of double barriers with a semimagnetic well. We believe these are unique signatures for quantum filtering.

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