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MA: Fachverband Magnetismus

MA 19: POSTER Ia

MA 19.10: Poster

Dienstag, 17. März 2015, 09:30–13:00, Poster A

Magnetization reversal process modeling in systems with different anisotropies — •Andrea Ehrmann¹ and Tomasz Blachowicz² — ¹Niederrhein University of Applied Sciences, Faculty of Textile and Clothing Technology, Germany — ²Silesian University of Technology, Institute of Physics, Poland

Examinations of magnetic systems by use of a single macro-spin can support understanding magnetization reversal processes in principal. Such a macro-spin calculation based on constant energy minimization during the reversal process from positive to negative saturation and vice versa has been implemented in PTC(c) Mathcad. It describes the coherent rotation of a single magnetic moment using the total energy density, consisting of different magnetic anisotropies as well as the external magnetic field. In this way, hysteresis loops of longitudinal and transverse magnetization components can be calculated. Besides coercive fields and shapes of the magnetization loops, the calculation can also be used to detect angular orientations of the sample relative to the external magnetic field for which the transverse signals vanish.

The calculated loops differ slightly from experimental results concerning shape and position, which can be attributed to the simplicity of the model neglecting the coupling between the single magnetic moments and the resulting fanning, as evident from more realistic Monte Carlo simulations. However, the simple macro-spin model can reproduce qualitatively all important features of the magnetization reversal in many thin-film and nano-structured samples [1].

[1] A. Ehrmann and T. Blachowicz, AIP Advances 4, 087115 (2014)