Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 55: Thin Films: Magnetic Anisotropy
MA 55.10: Vortrag
Donnerstag, 23. März 2017, 17:30–17:45, HSZ 101
Metadynamic study on magnetic anisotropy of thin films — •Balazs Nagyfalusi1, Laszlo Udvardi2,3, and Laszlo Szunyogh2,3 — 1Wigner Research Center for Physics, Budapest, Hungary — 2Department of Theoretical Physics, Budapest University of Technology and Economics, Budapest, Hungary — 3MTA-BME Condensed Matter Research Group, Budapest University of Technology and Economics, Budapest, Hungary
Magnetic anisotropy plays key role in several phenomena having importance in technological applications. In the present contribution the temperature dependence of the magnetic anisotropy energy (MAE) is investigated by means of metadynamic Monte Carlo simulations. Metadynamics1 is an adaptive biasing potential methods where the free energy of the system is explored along a collective variable (CV).
We studied a model of a ferromagnetic thin film with uniaxial on-site and two-site anisotropy. The CV has been chosen to be the normalized component of the magnetization perpendicular to the substrate. The temperature dependence of MAE provided by the simulations is in good agreement with the Callen-Callen2 theory in the case of on-site only anisotropy and an exponent close to 2 has been found at higher temperatures for the model containing two-site anisotropy. The competition of the on-site and two-site anisotropy may result in a reorientation of the magnetization which has been also confirmed by our simulations for mono and bi-layers.
1 A. Laio, M. Parrinello, PNAS 99, 12562 (2002)
2 H.B. Callen and E. Callen, J. Phys. Chem. Solids, 27, 1271 (1966)