Eur. Phys. J. B 78, 111-117 (2010)
https://doi.org/10.1140/epjb/e2010-10072-6

The energy bands of quantized spin waves and the uniaxial anisotropy in a biferromagnetic system

¹ College of Physical Science and Technology, Inner Mongolia University, Hohhot, 010021, P.R. China
² Department of Applied Physics, School of Mathematics, Physics and Biological Engineering, Inner Mongolia University of Science and Technology, Baotou, 014030, P.R. China
³ Inner Mongolia Key Laboratory of Physics and Chemistry of Functional Materials, College of Physics and Electronic Information, Inner Mongolia Normal University, Hohhot, 010022, P.R. China

Corresponding author: ^a ndghyun@imu.edu.cn

Received: 24 January 2010
Revised: 15 August 2010
Published online: 28 October 2010

Abstract

The eigenproblems of quantized spin waves in a (100) ferromagnetic bilayer system have been investigated theoretically using the interface rescaling approach. The energy-band structure of the system has been obtained and the effect of the uniaxial bulk anisotropy field of easy-axis type on the energy bands are explored thoroughly. It is found that all kinds of eigenmodes of the spin waves in the biferromagnetic system are determined by the bulk exchange coupling constant, the interface exchange coupling constant, the spin of lattice, the number of atomic layers and the uniaxial bulk anisotropy. Especially, we explore the effect of the uniaxial bulk anisotropy field of easy-axis type on the energy bands of first Brillouin zone and the existence condition of all kinds of the eigenmodes.