Regensburg 2019 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 15: Magnetism Poster A
MA 15.85: Poster
Dienstag, 2. April 2019, 10:00–13:00, Poster E
Metadynamics study on the reorientation transition in magnetic thin films — •László Udvardi1,2, Balázs Nagyfalusi1, and László Szunyogh1,2 — 1Department of Theoretical Physics, Buapest University of Technology and Economics — 2MTA-BME Condensed Matter Research Group, Budapest University of Technology and Economics
The competition between different type of anisotropies often leads to a reorientation of the magnetization direction. The temperature driven spin reorientation transition in thin films is usually explained by competing uniaxial on-site anisotropy and shape anisotropy. In the study we present the results of Monte Carlo simulations based on a classical Heisenberg model. The free energy landscape is sampled along a path relevant for the reorientation by means of well tempered metadynamics1. The simulation has been performed using model parameters and exchange tensors and anisotropy parameters obtained from ab-initio calculations. We demonstrate that the competing magnetic anisotropies result in both first and second order transitions.
1 Barducci, A. and Bussi, G. and Parrinello, M., Phys. Rev. Lett. 100, 020603 (2008)