Dresden 2011 – scientific programme
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MA: Fachverband Magnetismus
MA 22: Magnetic Measurement Methods
MA 22.7: Talk
Tuesday, March 15, 2011, 12:30–12:45, HSZ 403
Vectorial magnetometry and anisotropy studies on thin Co50Fe50 films using MOKE — •Timo Kuschel1, Jaroslav Hamrle2, Jaromir Pistora2, Subrojati Bosu3, Yuya Sakuraba3, Koki Takanashi3 und Joachim Wollschläger1 — 1Fachbereich Physik, Universität Osnabrück, Barbarastr. 7, 49069 Osnabrück, Germany — 2Department of Physics, VSB - Technical University of Ostrava, 17. listopadu 15, 70833 Ostrava-Poruba, Czech Republic — 3Institute for Materials Research (IMR), Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan
Magnetooptical Kerr effect (MOKE) is a powerful tool to determine magnetic properties of thin magnetic films. In some cases this technique is only applied to detect magnetization curves qualitatively. In order to perform a quantitative analysis we present MOKE measurements with s- and p-polarized incident light, using an external magnetic field either parallel or perpendicular to the plane of incidence of light and different orientations of the crystalline substrate. The processing of the data includes vectorial magnetometry as well as studies of the anisotropy constants and magnetic axes.
The investigated Co50Fe50 films of 50 nm thickness on MgO(001) are prepared with different annealing temperatures (RT up to 400∘C). On the one hand the films with lower annealing temperatures show typical magnetic reversal processes of samples with four-fold symmetry as expected for cubic crystal structures. On the other hand the film annealed at 400∘C presents an additional strong in-plane anisotropy, which is discussed in context of a classical free energy approach.