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MA: Fachverband Magnetismus

MA 18: Spindependent Transport II

MA 18.5: Vortrag

Mittwoch, 28. März 2007, 16:15–16:30, H22

Spin-orbit induced anisotropies in the tunneling magnetoresistance of magnetic tunnel junctions. — •Alex Matos Abiague and Jaroslav Fabian — Institute for Theoretical Physics, University of Regensburg, 93040 Regensburg, Germany

We investigate the spin-orbit coupling effects on the tunneling magnetoresistance of magnetic tunnel junctions. We propose a theoretical model in which the experimentally observed tunneling anisotropic magnetoresistance (TAMR) effect originates from the interplay between the Dresselhaus and Bychkov-Rashba spin-orbit couplings. Changes in the applied bias produce variations of the Bychkov-Rashba spin-orbit coupling strength that can result in a flipping of the axis of the two-fold symmetry of the TAMR. The theoretical calculations are in good agreement with recent experimental results.