Dynamic Spin-Polarized Resonant Tunneling in Magnetic Tunnel Junctions

Details Dynamic Spin-Polarized Resonant Tunneling in Magnetic Tunnel Junctions Dynamic Spin-Polarized Resonant Tunneling in Magnetic Tunnel Junctions

2007-09-22

arxiv.org/abs/0709.3556v1

PRL 99, 047206 (2007)

Physics

Condensed Matter

Materials Science

4pgs, 3 figs

Scientific paper

10.1103/PhysRevLett.99.047206

Precisely engineered tunnel junctions exhibit a long sought effect that occurs when the energy of the electron is comparable to the potential energy of the tunneling barrier. The resistance of metal-insulator-metal tunnel junctions oscillates with an applied voltage when electrons that tunnel directly into the barrier's conduction band interfere upon reflection at the classical turning points: the insulator-metal interface, and the dynamic point where the incident electron energy equals the potential barrier inside the insulator. A model of tunneling between free electron bands using the exact solution of the Schroedinger equation for a trapezoidal tunnel barrier qualitatively agrees with experiment.

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