Dresden 2011 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 63: Poster II (Surface Magnetism/ Magnetic Imaging/ Topological Insulators/ Spin Structures and Magnetic Phase Transitions/ Graphene/ Magnetic Thin Films/ Magnetic Semiconductors/ Magnetic Half-metals and Oxides/ Spin-dependent Transport/ Spin Excitations and Spin Torque/ Spin Injection and Spin Currents in Heterostructures/ Spintronics/ Magnetic Storage and Applications)
MA 63.38: Poster
Freitag, 18. März 2011, 11:00–14:00, P2
Proper Scaling of the Anomalous Hall Effect in Heusler Compounds — •Inga-Mareen Imort1, Patrick Thomas1, Günter Reiss1, Andy Thomas1, Franz D. Czeschka2, Matthias Althammer2, Alexander T. Krupp2, Rudolf Gross2, and Sebastian T. B. Goennenwein2 — 1Fakultät für Physik, Universität Bielefeld, Bielefeld, Germany — 2Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany
The anomalous Hall effect (AHE) is a fundamental but controversially discussed physical phenomenon in ferromagnets. We have studied the AHE in thin films of the Heusler compound Co2FeAl, at temperatures between 3 K and 300 K, with magnetic fields of up to 4 T perpendicular to the film plane. The Co2FeAl layers were deposited using rf-magnetron sputtering on single-crystal MgO (001) substrates, and annealed at different temperatures ex-situ. The structural quality of our samples was tested by X-ray diffraction scans. After etching Hall-bar mesa structures, we measured the evolution of the anomalous Hall resistance ρAHE and the longitudinal resistance ρxx with the sample annealing temperature, in order to investigate the contribution of the different microscopic mechanisms to the anomalous Hall effect. For comparison, we also have measured the AHE in iron and cobalt thin films. All our AHE data of the Heusler compound Co2FeAl show the typical behavior of an itinerant ferromagnet, with skew scattering and side-jump terms.
This work was supported by the NRW MIWF.