Spin-Dependent Surface Screening in Ferromagnets and Magnetic Tunnel Junctions
- 19 July 1999
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 83 (3) , 640-643
- https://doi.org/10.1103/physrevlett.83.640
Abstract
We have examined electron screening at the surface of a ferromagnetic metal. In an applied electric field, the surface develops an induced charge and magnetization. This can be described in terms of a novel spin-dependent screening electric field. A set of integrodifferential equations for screening potentials is derived and solved in some limiting cases. The significant implication relevant to spin-polarized transport in field emission and in magnetic tunnel junctions is discussed.Keywords
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