%0 Report
%D 2001
%T Hysteresis in Layered Spring Magnets
%A J. S. Jiang
%A H. G. Kaper
%A G. K. Leaf
%X This article addresses a problem of micromagnetics: the reversal of magnetic moments in layered spring magnets. A one-dimensional model is used of a film consisting of several atomic layers of a soft material on top of several atomic layers of a hard material. Each atomic layer is taken to be uniformly magnetized, and spatial inhomogeneities within an atomic layer are neglected. The state of such a system is described by a chain of magnetic spin vectors. Each spin vector behaves like a spinning top driven locally by the effective magnetic field and subject to damping (Landau-Lifshitz-Gilbert equation). A numerical integration scheme for the LLG equation is presented that is unconditionally stable and preserves the magnitude of the magnetization vector at all times. The results of numerical investigations for a bilayer in a rotating in-plane magnetic field show hysteresis with a basic period of 2pat moderate fields and hysteresis with a basic period of p at strong fields.
%B Discrete and Continuous Dynamical Systems-Series B
%P 219-232
%8 01/2001
%G eng
%1 http://www.mcs.anl.gov/papers/P867.ps.Z