(華中科技大學 電子科學與技術系，武漢 430074)
摘 要: 采用微磁學方法分析晶粒尺寸對Co基垂直磁記錄介質CoCrPt、TbFeCo和SmTbCo的磁化特征和過渡區(qū)噪聲性能的影響。結果表明，隨著晶粒尺寸的增加，3種Co 基介質的矯頑力和矯頑力矩形比均下降，過渡區(qū)噪聲(過渡區(qū)位置偏移σj)隨晶粒尺寸的增加而線性增大。在以上3種材料中，TbFeCo介質具有最大的矯頑力、矯頑力矩形比和最小的噪聲。因此，考慮到晶粒尺寸對介質矯頑力，矯頑力矩形比和過渡區(qū)噪聲的綜合影響，應該將介質的晶粒尺寸控制在較小的值。
關鍵字: Co基稀土介質；晶粒尺寸；過渡區(qū)噪聲；微磁學
（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
