Phys. Rev. Lett. 93, 046603 (2004) [4 pages]Impurity-Induced Tuning of Quantum-Well States in Spin-Dependent Resonant TunnelingReceived 18 November 2003; published 23 July 2004 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. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.046603
DOI:
10.1103/PhysRevLett.93.046603
PACS:
72.10.–d, 72.25.–b, 73.40.Gk
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.