γ-Fe_2O_3磁记录材料磁化强度分布的穆斯堡尔谱的研究

Mssbauer Studies of Distribution Magnetization in γ-Fe_2O_3 Recording Materials

r-Fe_2O_3磁记录材料中针状磁性粒子的磁矩空间分布决定了磁记录材料性能的优劣。本文提出了一种包含偏离对称参数的磁矩空间分布函数,P(θ,(?))=α_0+α_1cos^2 θ+α_2sin^2 θcos2(?)+α_3sin2 θsin(?)+α_4sin2 θcos(?)+α_5sin^2 θsin2(?),它是一种球谐函数的展开。通过理论分析并结合穆斯堡尔谱的测量,可以方便地获得取向比及磁矩的空间分布曲线。实验结果表明,磁记录带带平面内的磁矩空间分布是椭圆形分布;磁盘的磁矩分布在径向和切向是非对称的.这种新方法简单易行、可靠,有望在技术上得到广泛的应用。

The Performance of γ-Fe_2O_3 recording materials is determinedpredominantly by the angular distribution of magnetization of acicular particl-es of γ-Fe_2O_3.In this paper,a spatial distribution function containing devi-ation parameters from the symmetry of the axis,P(θ,(?))=α_0+α_1cos^2θ+α_2sin^2θcos2(?)+α_3sin2 θ sin (?)+α_4sin2 θ cos (?)+α_5sin^2θsin2 (?)were suggested.As theoretical analysis and M(?)ssbauer measuerments had beencompleted,the orientation ratios and distribution curve of magnetization wereObtained simply.The results indicated that this new method is a simple andreliable one.It is expected to obtain wide application in technology.