Exchange coupling bias field in antiferromagnetic/ferromagnetic bilayer system due to antiferromagnetic spin structures

Abstract

The exchange coupling bias field in the antiferromagnetic and ferromagnetic bilayer system is investigated within the framework of the classical Heisenberg model. The spin structures in the L1₀−type ordered phase and the disordered γ−phase of antiferromagnetic alloys including magnetic and non−magnetic atoms are obtained, and the magnetization loops are calculated by using the Landau−Lifshitz motion equation. The spin structure in an antiferromagnetic layer and the spin arrangement at an interface play very important roles for generation of the exchange coupling bias field in such bilayer systems.