Europhys. Lett.
Volume 73, Number 1, January 2006
Page(s) 104 - 109
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 30 November 2005
Europhys. Lett., 73 (1), pp. 104-109 (2006)
DOI: 10.1209/epl/i2005-10367-8

Topological defects, pattern evolution, and hysteresis in thin magnetic films

P. 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