Dresden 2009 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 13: Poster Ia: Electron Theory (1); Magnetic Imaging (2,3); Thin Films (4-25); MSMA (26-33); Magn. Semiconductors (34-42); Magn. Half Metals and Oxides (43-60)

MA 13.54: Poster

Dienstag, 24. März 2009, 10:15–13:00, P1A

Quadratic Magneto-optical Kerr Effect Magnetometry: Application to Co₂-based Heusler Compounds — •Peter Clausen, Jaroslav Hamrle, Simon Trudel, Oksana Gaier, and Burkard Hillebrands — FB Physik and Forschungszentrum OPTIMAS, TU Kaiserslauten, 67663 Kaiserslautern, Germany

In this poster, we present the results of our investigation of Co₂-based Heusler alloys using magneto-optical Kerr effect (MOKE) magnetometry. We find that in addition to the longitudinal MOKE signal, a strong quadratic MOKE signal is present.

As an example, in the first part of this poster we present our study of a series of Co₂MnSi thin films that were subjected to different annealing temperatures, which results in a variation of the degree of atomic ordering within the compound. We show the amplitude of the quadratic MOKE signal also varies as a function of annealing temperature.

In the second part, we present our new MOKE system that is capable of simultaneously measuring the linear and quadratic MOKE signals, as well as the isolated quadratic MOKE signal, in the presence of an arbitrarily aligned in-plane magnetic field.

Financial support by the DFG within the Forschergruppe 559 "Neue Materialien mit hoher Spinpolarisation" is gratefully acknowledged.