粒径分布对介质过渡区噪声影响的微磁学分析  

Micromagnetic analysis of effect of grain size distribution on transition noise in perpendicular recording medium

作　　者：李鹏[1] 程晓敏[1] 杨晓非[1] 

机构地区：[1]华中科技大学电子科学与技术系,湖北武汉430074

出　　处：《功能材料》2008年第7期1095-1098,共4页Journal of Functional Materials

基　　金：国家自然科学基金面上资助项目(60571010);国家自然科学基金重大资助项目(60490290)

摘　　要：采用微磁有限元方法,分析了粒径分布对垂直磁记录介质中过渡区噪声性能的影响。计算结果表明,颗粒间相互相互耦合作用可以增加介质的矫顽力和剩磁矩形比,使过渡区宽度有稍许减小,同时也使垂直于记录轨道方向的关联长度有一定增加。结果还表明,粒径为Voronoi分布的介质的过渡区噪声高于粒径为一致分布的介质,且随着颗粒间相互交换耦合作用增加和记录密度的提高,噪声的差值也会变大。因此,可以通过采用粒径具有一定分布的介质来减弱颗粒间相互交换耦合作用和记录密度对介质过渡区噪声的影响。The article analyzed the effect of the grain size distribution on the transiton noise properties of perpen- dicular magnetic recording medium with micromagnetic simulation. Numerical results showed that the interg- ranular exchange coupling increased the coercivity and the remanance magnetization loop squareness, also it shortened the transition length while enlarged the cross track correlation length. Numerical results also showed that the transition noise of the medium with Voronoi distributed grain sizes is higher than the medium with uni- form grains, and the differece of the transition noise raised with the increase of the intergranular exchange coupling and the recording density. Thus, it is applicable to use the medium with non-uniform grains to balance the effects of the intergranular exchange coupling and the recording density.

关 键 词：粒径分布 过渡区噪声 微磁学 颗粒间相互交换耦合 

分 类 号：O482.3[理学—固体物理]