垂直磁记录薄膜实施剩余磁化测量时退磁场的补偿

对于垂直磁记录薄膜，进行剩余磁化强度的测量时，必须补偿退磁场.提出一种新方法，在直流退磁剩磁和等温剩磁测量中采用有效反向磁场来直接补偿退磁场.从而可以正确地得出垂直磁记录薄膜的ΔM曲线并评价晶粒间的磁相互作用.还采用了三种方法来确定其中的关键参数——退磁因子.结果表明，c轴垂直取向的钡铁氧体薄膜中，晶粒间的磁相互作用是交换偶合型的；而Co-Cr-Ta薄膜中，晶粒间磁相互作用是静磁相互作用. 关键词： 退磁场补偿 直流退磁剩磁(DCD) 等温剩磁(IRM) ΔM曲线

Compensation for the demagnetizing field in remanence measurements of perpendicular magnetic recording films

It is necessary to compensate for the demagnetizing field in remanence measurements of perpendicular magnetic recording films.In this paper,a new method of compensating for the demagnetizing field is proposed and an effective reverse field Heff is used to evaluate the dc demagnetization remanence curves,isothermal remanent magnetization curves,and the ΔM plots for perpendicular magnetic recording films.The demagnetization factor N is important for this method,and three methods are used to estimate the value of N. The results of the ΔM plots indicate that the intergranular interactions in Ba ferrite films seem to be of exchange coupling,while those in Co-Cr-Ta films are of magnetostatic interactions.