(华中科技大学 电子科学与技术系，武汉 430074)
摘 要: 采用微磁学方法分析晶粒尺寸对Co基垂直磁记录介质CoCrPt、TbFeCo和SmTbCo的磁化特征和过渡区噪声性能的影响。结果表明，随着晶粒尺寸的增加，3种Co 基介质的矫顽力和矫顽力矩形比均下降，过渡区噪声(过渡区位置偏移σj)随晶粒尺寸的增加而线性增大。在以上3种材料中，TbFeCo介质具有最大的矫顽力、矫顽力矩形比和最小的噪声。因此，考虑到晶粒尺寸对介质矫顽力，矫顽力矩形比和过渡区噪声的综合影响，应该将介质的晶粒尺寸控制在较小的值。
关键字: Co基稀土介质；晶粒尺寸；过渡区噪声；微磁学
（Department of Electronic Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China）
Abstract:The effect of grain size on the transition noise performance of Co-based rare earth perpendicular recording medium including CoCrPt, TbFeCo and SmTbCo was investigated with micromagnetic simulation. The numerical results show that the large grain size reduces the coercivity and the coercive loop squareness while increases the position jitter. The numerical results also show that TbFeCo has the highest coercivity, coercive loop squareness and lowest transition noise parameters among the studied materials. The results indicate that it is necessary to keep the grain size at a relatively small value considering the synthesized effects of the grain size on the coercivity, coercive loop squareness and the transition noise of the film.
Key words: Co-based rare earth medium; grain size; transition noise; micromagnetics
