GdFeCo/AlN/DyFeCo静磁耦合多层薄膜磁化方向转变的研究

Investigation of Magnetization Transition in GdFeCo/AlN/DyFeCo Magnetostatically Coupled Multilayer Films

对 Gd Fe Co/Al N/Dy Fe Co静磁耦合多层薄膜变温磁化方向变化进行了研究。结果表明读出层 Gd Fe Co随温度上升从平面磁化转变成垂直磁化 ,转变过程中受饱和磁化强度 (Ms)和有效各向异性常数影响 ,但主要受饱和磁化强度 (Ms)的影响。在高温时读出层的磁化强度很小 ,退磁场能减小 ,在静磁耦合作用下 ,使 Gd Fe Co读出层的磁化方向发生转变 ,而且磁化方向的转变在较小的温度范围内变化较快。

Magnetization transition from in-plane to perpendicular caused by temperature changes was investigated for the magnetostatically coupled multilayer films (GdFeCo/AlN/DyFeCo). The results indicate that the magnetization orientation of the readout layer (GdFeCo) is affected by the saturation magnetization and the effective anisotropy energy, but the transition occurs mainly as a result of the change of the saturation magnetization. At high temperature the saturation magnetization and the demagnetizing energy of the GdFeCo layer decrease, then the transition of the GdFeCo layer from in-plane to perpendicular magnetization occurs due to the magnetostatically coupled interaction. The magnetization direction of the readout layer changes rapidly in a narrow temperature range.