中国物理B ›› 2013, Vol. 22 ›› Issue (6): 68506-068506.doi: 10.1088/1674-1056/22/6/068506
• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇 下一篇
王颖, 王锐, 谢海龙, 白建民, 魏福林
Wang Ying (王颖), Wang Rui (王锐), Xie Hai-Long (谢海龙), Bai Jian-Min (白建民), Wei Fu-Lin (魏福林)
摘要: Compositing soft and hard materials is a promising method to decrease the coercivity of L10 FePt, which is considered to be a suitable material for bit patterned media. This paper reports the simulation of three models of FeCo/L10 FePt exchange-coupled composite particles for bit patterned media by micromagnetic simulation software OOMMF. The three models are: enclosed model, side-enclosed model, and top-covered model. All of them have the same volumes of soft and hard parts but different shapes. Simulation results show that the switching fields for the three models can be reduced to about 10 kOe (1 Oe = 79.5775 A/m) and the factor gain can be improved to 1.4 when the interface exchange coefficient has a proper value. Compared to the other models, the enclosed model has a wider range of interface exchange coefficient values in which low switching field and high gain can be obtained. The dependence of switching fields on the angle of the applied field shows that none of the three models are easily affected by the stray field of a magnetic head.
中图分类号: (Magnetic device characterization, design, and modeling)