Regensburg 2010 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 10: Poster I
MA 10.36: Poster
Dienstag, 23. März 2010, 10:45–13:45, Poster A
Magnetotransport measurements on Heusler compounds — •A. Krupp1, F.D. Czeschka1, M. Althammer1, S.T.B. Goennenwein1, R. Gross1, I.-M. Imort2, G. Reiss2, and A. Thomas2 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — 2Fakultät für Physik, Universität Bielefeld, Bielefeld, Germany
Magnetic anisotropy (MA) is of fundamental importance in ferromagnets, as it strongly influences their properties. Using magnetotransport measurements, we investigate the MA of the Heusler compound Co2FeAl. A 20 nm thick Co2FeAl film on (001)-oriented MgO substrate was patterned into Hall-bar mesa structures with optical lithography and etching. The anisotropic magnetoresistance (AMR) is then measured with the external magnetic field applied in the film plane. The measured longitudinal and transverse resistance show a clear field dependence with distinct steps at small external magnetic fields (µ0H), indicating abrupt switching of the magnetization orientation. To quantify the MA, we record the angle dependent magnetoresistance (ADMR), i.e. the MR as a function of H-orientation for different magnetic field magnitudes |H|. From the ADMR data taken at high |H|, AMR coefficients are obtained. The MA is then extracted from ADMR at lower |H|. We obtain a cubic MA field of around µ0Hcub=5 mT and an uniaxial MA field of around µ0Huni=1 mT. We also discuss the evolution of MA with temperature and compare our results to literature.
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