Spin filtering and magnetoresistance in ballistic tunnel junctions

Details Spin filtering and magnetoresistance in ballistic tunnel junctions Spin filtering and magnetoresistance in ballistic tunnel junctions

2001-03-21

arxiv.org/abs/cond-mat/0103442v2

Published in Phys. Rev. B 64, 195319 (2001)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Added references + corrected typos

Scientific paper

10.1103/PhysRevB.64.195319

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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