Eur. Phys. J. B 36, 215-220 (2003)
https://doi.org/10.1140/epjb/e2003-00338-5

Periodic instantons and domain structure in a ferromagnetic film

¹ Institute of Theoretical Physics and Department of Physics, Shanxi University, Taiyuan, Shanxi 030006, P.R. China
² Department of Physics, Yanbei Normal Institute, Datong, Shanxi 037000, P.R. China

Corresponding author: ^a zhenggongping@yahoo.com.cn

Received: 19 May 2003
Revised: 6 August 2003
Published online: 8 December 2003

Abstract

We in this paper study periodic instantons and domain structures in a theoretical film consisting of biaxial-anisotropic ferromagnets. In a proper approximation the equation of motion of the magnetization vector as a space-time function in the film is reduced to the 1+2-dimensional sine-Gordon field equation in strong anisotropy limit. Static periodic instantons, which are solutions of Euclidean field equantion, and various new domain structures are obtained analytically. We also investigate the energy density and stability of the periodic instantons.