Eur. Phys. J. B 48, 519-528 (2005)
https://doi.org/10.1140/epjb/e2006-00001-9

Nonlinear dynamics for magnetic systems with a single-spin potential with variable shapes

¹ The Abdus Salam International Centre for Theoretical Physics, P.O. Box 506, Strada Costiera, 34014 Trieste, Italy
² Laboratoire de Physique, École Normale Supérieure de Lyon 46,  Allée d'Italie, 69364 Lyon Cedex 07, France
³ Condensed Matter Laboratory, Department of Physics, Faculty of Science, University of Douala, P.O. Box 24157, Douala, Cameroon
⁴ Laboratoire de Mécanique, Faculté des Sciences, Université de Yaoundé I, B.P 812, Yaoundé, Cameroun

Corresponding author: ^a nguenang@yahoo.com

Received: 8 December 2004
Revised: 15 October 2005
Published online: 19 January 2006

Abstract

Results of computer simulations to investigate the spin dynamics of a classical ferromagnet subject to easy-plane anisotropy and a parameterized Zeeman energy are reported. The variability of the Zeeman term induces a deformable substrate potential in the system. The results show substantial deviations between the conventional sine-Gordon and deformable sine-Gordon description. Solitary-like solutions, shock waves, nanopteron waves and a variety of phenomena, including large easy-plane deviations are also observed. The results display ballistic, diffusive as well as stochastic behaviors. The region of parameters and limits of applicability of deformability effects induced by parameterization of the Zeeman energy are examined.