Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 48: Poster Session II

MA 48.15: Poster

Donnerstag, 10. März 2016, 15:00–18:00, Poster B1

d.c. voltages in Fe/(Ga,Mn)As induced by ferromagnetic resonance — •lin chen, martin decker, robert islinger, markus härtinger, matthias kronseder, dieter schuh, dominique bougeard, christian back, and dieter weiss — Institut für Experimentelle und Angewandte Physik, Universität Regensburg, 93040 Regensburg, Germany

The electrical detection of magnetization dynamics is by now a common method in spintronic devices operation. In this work, we investigate the dc voltages occurring in a Fe/(Ga,Mn)As structure under ferromagnetic resonance.

The sample consists of Fe (5 nm) and (Ga,Mn)As (50 nm) grown on GaAs (001) semi-insulating substrate by molecular-beam epitaxy. The Fe/(Ga,Mn)As stripe is integrated between the signal and ground line of the coplanar waveguide, where the ferromagnetic stripe is excited by an out-of-plane magnetic field. The dc voltage is measured as a function of the external magnetic field.

The characteristic dc voltage spectrum can be observed at each magnetic field angle, which can be decomposed into a symmetric Vsym and an anti-symmetric Va-sym component. The two components show distinct difference in their angular dependence. A detailed analysis shows that Va-sym is induced by the anisotropic magnetoresistance (AMR) of Fe; while Vsym is related to spin pumping from Fe into (Ga,Mn)As.

This work is supported by the German Science Foundation (DFG) via SFB 689. L. Chen is also grateful for support from Alexander von Humboldt Foundation.