Regensburg 2013 – scientific programme

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MA: Fachverband Magnetismus

MA 48: Spin-dependent Transport Phenomena

MA 48.5: Talk

Friday, March 15, 2013, 10:30–10:45, H23

Magnetotransport in hybrid ferromagnet/semiconductor heterostructures — •Alex Matos-Abiague and Jaroslav Fabian — Institute for Theoretical Physics, University Regensburg, 93040 Regensburg, Germany

The effects of the spin-orbit coupling (SOC) on the magnetotransport of hybrid ferromagnet/semiconductor heterostructures are discussed. In such systems the SOC fields at the ferromagnet/semiconductor interface lower the symmetry of the corresponding bulk materials. As a consequence anisotropic effects emerge in both spin and charge transport. We explore the symmetries of the SOC fields in structures with a single ferromagnetic layer and how they manifest in phenomena such as tunneling anisotropic magnetoresistance (TAMR) in magnetic tunnel junctions and anisotropic magnetoresistance (AMR) in lateral hybrid devices. Based on general symmetry considerations, we investigate how the dependence of the TAMR on the magnetization direction is determined by the specific form of the SOC field. With regard to the AMR in hybrid lateral devices we show that in addition to the usual magnetoresistance dependence on the angle between magnetization and charge current (noncrystalline AMR), a dependence on the current flow direction with respect to a reference crystallographic axis (crystalline AMR) emerges. The crystalline anisotropy of the anomalous Hall effect is also discussed.

This work was supported by the DFG (Grant No. SFB 689).