Topological defects, pattern evolution, and hysteresis in thin magnetic filmsP. A. Prudkovskii1, A. N. Rubtsov1 and M. I. Katsnelson2
1 Department of Physics, Moscow State University - 119992 Moscow, Russia
2 Institute for Molecules and Materials, Radboud University Nijmegen 6525 ED Nijmegen, The Netherlands
received 2 July 2005; accepted in final form 4 November 2005
published online 30 November 2005
The nature of the magnetic hysteresis for thin films is studied by the Monte Carlo simulations. It is shown that a reconstruction of the magnetization pattern with external field occurs via the creation of vortex-antivortex pairs of a special kind at the boundaries of stripe domains. It is demonstrated that the symmetry of the order parameter is of primary importance for this problem, in particular, the in-plane magnetic anisotropy is necessary for the hysteresis.
75.60.Ch - Domain walls and domain structure.
75.60.Ej - Magnetization curves, hysteresis, Barkhausen and related effects.
75.70.Ak - Magnetic properties of monolayers and thin films.
© EDP Sciences 2005