Berlin 2012 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 38: MagneticThin Films I

MA 38.7: Vortrag

Donnerstag, 29. März 2012, 11:00–11:15, H 0112

Analysis of anisotropy constants for Co₅₀Fe₅₀ and Fe films investigated by MOKE — •Timo Kuschel¹, Jaroslav Hamrle², Jaromir Pistora², Kesami Saito³, Subrojati Bosu³, Yuya Sakuraba³, Koki Takanashi³, Henrik Wilkens¹, and 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

Differently prepared Co₅₀Fe₅₀ and Fe 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 cubic and the uniaxial magnetic anisotropy constant as well as the domain wall pinning energy are determined using the classic Stoner-Wohlfarth model. The Co₅₀Fe₅₀ films show a decreasing domain wall pinning energy with increasing annealing temperature due to fewer defects in the film. The analysis of the Fe film measurements reveal a decreasing domain wall pinning energy for films with increasing lateral crystallite size obtained by grazing incidence x-ray diffraction (GIXRD). This can also be explained by fewer defects in the film.