DPG Phi
Verhandlungen
Verhandlungen
DPG

Dresden 2009 – scientific programme

Parts | Days | Selection | Search | Downloads | Help

HL: Fachverband Halbleiterphysik

HL 12: Spin controlled transport I

HL 12.2: Talk

Tuesday, March 24, 2009, 09:45–10:00, BEY 81

Magnetic field dependence of the tunneling anisotropic magnetoresistance effect in Fe/GaAs/Au tunnel junctions — •Michael Wimmer1, Michael Lobenhofer2, Alex Matos-Abiague1, Jaroslav Fabian1, Dieter Weiss2, and Klaus Richter11Institut für Theoretische Physik, Universität Regensburg, 93040 Regensburg — 2Institut für Experimentelle und Angewandte Physik, Universität Regensburg, 93040 Regensburg

Recent experiments on the tunneling anisotropic magnetoresistance (TAMR) effect in Fe/GaAs/Au tunnel junctions found a peculiar magnetic field dependence in high fields: Depending on the bias voltage, the TAMR effect may increase or decrease linearly with magnetic field.

We explain these findings by including the orbital effects of the magnetic field in a previously developed theoretical description of the TAMR effect in terms of Rashba and Dresselhaus spin-orbit coupling [1]. Both numerical simulations as well as a phenomenological model agree well with experiment. The high-field behavior is found to be dominated by an interplay between the Dresselhaus spin-orbit coupling in the GaAs barrier and the orbital effects of the magnetic field.

J. Moser et al., Phys. Rev. Lett. 99, 056601 (2007).

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2009 > Dresden