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R.F.制造的光稀土金属无定形膜的磁性和磁光特性。溅射，还可以获取有关磁光存储介质的信息。以下内容可以总结为结果； i）在室温下，在室温下为10^7erg/cc的垂直磁性膜的垂直磁性膜成功地获得了（nd，pr）_x（fe，co）_x（fe，co）_x（fe，co）_x（fe，co）100 < - <-x> yeloy <-x> yeloy <-x> Alloy> y salloy，沉积在大约150至280°c.ii的玻璃基板上）各向异性常数k_u在300K处的k_u最大为x = 40，ND和PR合金均为x = 40）。IIII）III）K_U的值随温度的降低而增加，温度降低，温度低于约70K。该结果与获得的磁化曲线在150KOE的高场中的磁化曲线是一致的。这可能与各向异性分散物密切相关。IV）IV）对于这些无定形薄膜，磁光光线kerr旋转角度O_K在800 nm处O_K O_K，比大约0.4-0.5 r的磁性薄膜大于稀有的稀有地球。 O_K随着波长的降低而增加，这与沉重的稀土相反。添加约10％的结核病很大程度上改善了磁光和磁光的特性。在这些结果的观点中，可以将光的稀土 - 透明金属非晶膜视为磁光记录存储媒体的潜在候选，其性能比具有较重稀有地球的磁光记录培养基更好。