Asymmetric magnetization reversal behavior and noncollinear anisotropy in exchange-bias system

In this paper it is studied that the asymmetry of the magnetization reversal strongly depends on the angle between the easy axis of the FM or AFM and the applied field. Different angle reveals different reversal process. However, in the exchange-bias systems with different ferromagnetic(FM) magnetization revealing under small FM anisotropy a reorientation of the effective anisotropy occurs due to a new noncollinear for anisotropy term, which is unambiguously induced from interface exchange coupling between FM and anti-ferromagnetic layer. The evidence of the relation between noncollinear anisotropics of the FM anisotropy and interface exchange coupling and asymmetric magnetization reversal is also displayed.