The Direction Of Magnetization In Exchanged-Coupled Hard/Soft Magnetic Bilayer Under Erternal Stress

In recent years, the perpendicular record of information is considered to be one of the most promising technologies in magnetic record. Trying to produce perpendicular magnetic anisotropy in magnetic materials is of great significance because of lacking the material with perpendicular magnetic anisotropy. The external stress can be used to adjust the physical properties of magnetic materials, for example, the direction of easy magnetization and magnetic relaxation of materials. This article will focus on the influence of external stress on the perpendicular magnetic anisotropy of magnetic materials.In the present work, the perpendicular magnetic anisotropy in exchange-coupled hard/soft magnetic bilayer system has been studied in detail with the direction of external stress along the films and perpendicular to the films by using the minimum principle of energy. The effect of external magnetic field, soft layer thickness, the strength of interfacial exchange coupled and the strength of external stress on the direction of magnetization are investigated. It is shown that the perpendicular magnetic in films will be promoted by decreasing the soft layer thickness and external magnetic field, the perpendicular magnetic in hard layer and the in-plane magnetic in soft layer will be promoted by decreasing the strength of interfacial exchange coupled. While external stress is along the films, the in-plane magnetic in films will be promoted by the increase of the strength of external stress in both hard and soft layer. However, when external stress is perpendicular to the films, the perpendicular magnetic in films will be promoted by increasing the strength of external stress in double layers.