垂直磁记录介质Co－CoO膜的磁畴结构和反磁化机理

Domain Structures and Magnetization Reversal Mechanism in Co-CoO Medium for Perpendicular Recording

应用Ｌｏｒｅｎｔｚ显微术观察了反应蒸镀的Ｃｏ－ＣｏＯ膜的磁畴结构。当垂直各向异性场Ｈ＿ｋ和磁化强度相对垂直取向比增加时，它的磁畴结构从典型的１８０°面内畴变成点状畴，后老是单轴垂直磁各向异性介质的一种典型特征。用ＶＳＭ测量的ＯＲ的角度依赖性显示了垂直磁各向异性的Ｃｏ－ＣｏＯ膜中存在一定量的面内磁化强度分量。结合对矫顽力Ｈ＿ｃ，剩磁矫顽力Ｈ＿（ｃｒ）和磁滞损耗Ｗ＿ｈ的角度依赖性测量结果进行分析，可以得出结论：这种垂直磁各向异性的Ｃｏ－ＣｏＯ膜的反磁化机理是磁矩的涡旋式（Ｃｕｒｌｉｎｇｍｏｄｅ）非一致转动过程。

Domain structures of the reactively evaporated Co- CoO films have been observed by Lorentz microscopy. As the perpendicular anisutropy field H_k and the relative perpendicular orientation ratio OR⊥= SR⊥/SR of the magnetization increased,the domain structure of the film turns from a typical 180° in-plane domain structure to be a dot-like domain structure,whicn is a typical character of the uniaxial perpendicular anisotropie medium. The angular dependence of the OR measured by the VSM has shown that a certain extent in-plane magnetization component is still existed in the perpendicular anisotropic Co-CoO film, Com-bining the observation results of magnetic domains with the VSM measured results including the angular dependences of the coercivity H_c, the remanent coercivity H_(cr) and the hysteresis loss W_h,the mechanism of magnetization reversal for Co-CoO film with perpendicular anisotropy is considered as a curling mode of incoherent rotation process of the magnetic moments.