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DF: Fachverband Dielektrische Festkörper

DF 22: Poster II

DF 22.13: Poster

Freitag, 15. März 2013, 10:30–13:30, Poster D

Magnetization reversal analysis of thin magnetic films studied by magnetooptic Kerr effect including superimposed uniaxial and cubic magnetic anisotropy — •Timo Kuschel¹, Jaroslav Hamrle², Jaromir Pistora², Kesami Saito³, Subrojati Bosu³, Yuya Sakuraba³, Koki Takanashi³, Henrik Wilkens⁴, and Joachim Wollschläger⁴ — ¹University of Bielefeld, Germany — ²Technical University of Ostrava, Czech Republic — ³Tohoku University of Sendai, Japan — ⁴University of Osnabrück, Germany

Fe and Co₅₀Fe₅₀ films on MgO(001) are investigated by vectorial magnetometry via magnetooptic Kerr effect (MOKE). Measurements using s- and p-polarized incident light and an external magnetic field either parallel or perpendicular to the incidence plane of light are performed. Additionally, different in-plane orientations of the crystalline samples with respect to the external magnetic field are analyzed.
The observed magnetic reversal processes reveal two in-plane magnetic easy axes (MEAs) of different strength which are not orthogonal. Atypical magnetization curves including multidomain states with some magnetic moments providing antiparallel alignment to the external field (if projected to the direction of the external field) confirm the appearance of differently strong MEAs. This magnetic structure can be explained by a cubic magnetic anisotropy (CMA) induced by the crystalline film structure superimposed by an additional uniaxial magnetic anisotropy (UMA) which is not parallel to one of the MEAs of the CMA. The results are compared with regular magnetic films having a UMA parallel to one of the MEAs of the CMA.