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

目前研究的目标是调查由r.f.制作的光罕见的地球过渡金属畸变电影的磁性和磁光学性能。为磁光学存储媒体提供探测和信息，后续可能按结果汇总;i）在房间温度下，<less than or similar>根据10^7 erg/cc的顺序，在100 ^7 erg/cc的大尺度磁性介质中，可以成功地获得（Nd，Pr）_x（Fe，Co）100_&lt;-x&gt;合金与10 x50<less than or similar>，当他们在大约150 - 280 ° C时沉积玻璃基板加热时，300 K的不同常数K_u在x=40的两个Nd和Pr合金的最大值。你因温度下降而增加，并倾向于温度低于70 K。此结果与那些在150 KOe的高场中以磁性曲线保持一致。这可以与其他分散密切相关。iv）磁光学Kerr旋转角度O_k在800 nm处的这些畸变薄膜大约是0.4-0.5，而对于那些具有重稀有earths来说，这个结果是更大的。如果O_k因退化的波浪长度而增加，那么与沉重的稀有地球相比，这是一个对比。通过增加约10%的Tb，增加了磁性和磁性光学字符学。从这些结果来看，很少的接地过渡金属畸变电影可以被认为是一种潜在的磁性光学记录存储媒体与那些具有重型稀有的接地相比更好的性能。

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.