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Light Rare Earth-Transition Metal Amorphous Films with Huge Perpendicular Magnetic Anisotropy. Magneto-optical Recording Media

具有巨大垂直磁各向异性的轻稀土-过渡金属非晶薄膜。

基本信息

批准号：
60550221
负责人：
SUZUKI Takao
金额：
$ 1.41万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1987
项目状态：
已结题

项目摘要

The aim of the present study is to investigate the magnetic and magneto-optical properties of light rare earth-transition metal amorphous films fabricated by r.f. sputtering, and also to obtain information for magneto-optical storage media.The followings may be summarized as the results;i) The vertically magnetized films with huge perpendicular magnetic anisotropy of the order of 10^7erg/cc at room temperature have been successfully obtained for (Nd,Pr)_x (Fe,Co)100_<-x> alloys with 10<less than or similar>x<less than or similar>50, when they were deposited onto glass substrates heated at about 150 to 280゜C.ii) The anisotropy constant K_u at 300K is maximum at x=40 for both Nd and Pr alloys.iii) The value of K_u increases with decreasing temperature and tends to decrease for temperatures less than about 70K. This result is consistent with those obtained form the magnetization curves in a high field of 150KOe.This can be closely related to the anisotropy dispersion.iv) The magneto-optical Kerr rotation angle O_k at 800 nm for these amorphous films is about 0.4-0.5゜, which is larger than that for those with heavy rare earths. The O_k increases with decreasing wavelength, which is in contrast to that for heavy rare earths. The addition of Tb with about 10 at% much improves both the magnetic and magneto-optical characteristics.In view of these results, light rare earth-transition metal amorphous films can be considered as potential candidates for magneto-optical recording storage media with better performance than those with heavy rare earths.

本研究的目的是研究利用射频溅射制备的轻稀土过渡金属非晶薄膜的磁性和磁光特性，并为磁光存储介质提供信息。研究结果如下：i)将（Nd,Pr）_x (Fe,Co)100_<-x>合金沉积在约150 ~ 280 C加热的玻璃基板上，在室温下成功获得了垂直磁各向异性为10^7erg/cc量级的垂直磁化膜，>0 <或类似>x<或类似>50。ii) Nd和Pr合金在300K时各向异性常数K_u在x=40时最大。(3) K_u值随着温度的降低而增大，小于约70K时有减小的趋势。这一结果与在150KOe高磁场下的磁化曲线结果一致。这可能与各向异性色散密切相关。iv)这些非晶膜在800nm处的磁光Kerr旋转角O_k约为0.4-0.5，比重稀土膜的大。O_k随波长的减小而增大，而重稀土则相反。加入约10% at%的Tb，大大改善了材料的磁性和磁光特性。由此可见，轻稀土过渡金属非晶薄膜具有比重稀土过渡金属非晶薄膜更好的性能，可作为磁光记录存储介质的潜在候选材料。