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MA: Fachverband Magnetismus

MA 27: Magnetic Thin Films II of 2

MA 27.3: Talk

Wednesday, March 13, 2013, 15:30–15:45, H3

Longitudinal transport properties of Fe films on GaAs(001) — •S Wimmer¹, S Bornemann¹, D Ködderitzsch¹, J Minár¹, T Hupfauer², D Weiss², and H Ebert¹ — ¹Department Chemie, Ludwig-Maximilians-Universität München — ²Department Physik, Universität Regensburg

We have applied the fully relativistic spin-polarized Korringa-Kohn-Rostoker method to investigate the longitudinal transport properties of Fe layers on GaAs(001) substrates. Our theoretical approach is based on the linear response Kubo formalism that allows to introduce a layer-resolved conductivity σ^IJ for two-dimensional systems [1] and that has been extended to the fully relativistic case. For the Fe_n/GaAs(001) metal/semiconductor surface system our results qualitatively reproduce the experimentally observed in-plane anisotropy (IPA) of the resistivity which is caused by the the low symmetry of the underlying surface. Our results demonstrate in particular that the anisotropic magnetoresistance (AMR) as well as the surface induced IPA are sensitive to the substrate termination and thickness of the Fe overlayer.
[1] W.H. Butler, et al. Phys. Rev. B 52, 13399 (1995)