Impurity-Induced Tuning of Quantum-Well States in Spin-Dependent Resonant Tunneling

Alan Kalitsov, A. Coho, Nicholas Kioussis, Anatoly Vedyayev, M. Chshiev, and A. Granovsky
Phys. Rev. Lett. 93, 046603 – Published 23 July 2004

Abstract

We report exact model calculations of the spin-dependent tunneling in double magnetic tunnel junctions in the presence of impurities in the well. We show that the impurity can tune selectively the spin channels giving rise to a wide variety of interesting and novel transport phenomena. The tunneling magnetoresistance, the spin polarization, and the local current can be dramatically enhanced or suppressed by impurities. The underlying mechanism is the impurity-induced shift of the quantum well states (QWSs), which depends on the impurity potential, impurity position, and the symmetry of the QWS.

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  • Received 18 November 2003

DOI:https://doi.org/10.1103/PhysRevLett.93.046603

©2004 American Physical Society

Authors & Affiliations

Alan Kalitsov1, A. Coho1, Nicholas Kioussis1,*, Anatoly Vedyayev2, M. Chshiev3, and A. Granovsky2

  • 1Department of Physics, California State University, Northridge, California 91330-8268, USA
  • 2Faculty of Physics, Lomonosov Moscow State University, 119992 Moscow, Russia
  • 3Department of Physics, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0435, USA

  • *Electronic address: nick.kioussis@csun.edu

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Vol. 93, Iss. 4 — 23 July 2004

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