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MA: Fachverband Magnetismus

MA 15: Magnetic Half-metals and Oxides I

MA 15.1: Vortrag

Mittwoch, 24. März 2010, 10:15–10:30, H22

Quadratic MOKE studies on epitaxial Co₂FeAl_0.5Si_0.5 films — •Georg Wolf¹, Simon Trudel², Helmut Schultheiss¹, Jaroslav Hamrle¹, Koichiro Inomata³, and Burkard Hillebrands¹ — ¹FB Physik and Landesforschungszentrum OPTIMAS, TU Kaiserslautern, 67663 Kaiserslautern, Germany — ²Department of Chemistry, University of Calgary, Canada — ³Magnetic Materials Center, National Institute for Materials Science (NIMS), Tsukuba, Japan

Magneto-optical Kerr effect (MOKE) is often used to study the quasi-static, as well as the dynamic properties of the magnetization. While in most cases only the linear response (LMOKE) is observed, some materials show also a quadratic magneto-optical Kerr effect (QMOKE). Recently, QMOKE has been observed in the Co-based Heusler compounds [1], which are promising materials due to their predicted high spin polarization at the Fermi level.
We introduce a new MOKE setup which is designed to systematically investigate the QMOKE on Heusler thin films on a routinely basis [2]. The setup provides access to the combined LMOKE and QMOKE signal, as well as the pure QMOKE signal, each probed by an individual probing beam. We report on first results obtained on Co₂FeAl_0.5Si_0.5 epitaxial thin films prepared in the group of K. Inomata, Japan. The dependence of the QMOKE as a function of the annealing temperature is investigated. Financial support by the DFG Research Unit 559, New Materials with High Spin Polarization is gratefully acknowledged.
O. Gaier et al. Appl. Phys. 103, 103910 (2008).
S. Trudel et al. accepted by Rev.Sci.Inst.