Study on the properties and application of rare earth-iron group multi-component amorphous thin films

稀土-铁族过渡金属（RE-TM）非晶薄膜的磁性和磁光性质的基础性认识进行了系统的研究。从应用的角度来看，高质量的磁光记录材料也得到了发展。1.系统地测量了各种RE-TM薄膜的磁光光谱，并根据能带结构对它们进行了解释。2.观察和了解不同稀土元素对垂直磁各向异性和磁致伸缩的贡献。3.磁光盘用超高密度记录材料耐腐蚀性的提高与发展。4.利用人工超晶格诱导垂直磁各向异性。本研究最重要的成果是系统地了解了各种稀土的磁光效应。特别是首次从实验上系统地证明了4f电子对磁光效应的贡献。对于垂直各向异性和磁致伸缩效应的研究还有待于进一步的实验研究，但已经发现了一些有趣的结果，如非晶Gd的磁致伸缩效应和ErCo组分调制薄膜的垂直各向异性效应，并开发了一种新的用于短波长激光超高密度光盘存储的磁光记录材料。Nd合金/Tb合金双层膜的克尔旋转大于TbFe，磁化强度垂直于膜面。

Rare earth - iron group transition metal (RE-TM) amorphous films have been systematically studied for the fundamental understanding of their magnetic and magnetooptical properties. From the application point of view, high quality magnetooptical recoding materials have been also developed.The important results and findings are summarized as follows. 1. Systematic measurements of magnetooptical spectra for various RE-TM films and their interpretation based on the band structure. 2. Observation and understanding of the contribution of various RE to the perpendicular magnetic anisotropy and the magnetostriction. 3. Improvement of the corrosion resistance and development of ultra high density recording materials for magnetooptical disks. 4. Inducement of perpendicular magnetic anisotropy using artificial superlattices.The most important results of this research is that the magnetoptical effects of various RE are systematically understood. Especially it is the first time that the contribution of 4f electrons to the magnetooptical effect is experimentally and systematically proved. As for the perpendicular anisotropy and magnetostriction, systematic study is still open for further experiments but some interesting results, such as the magnetostriction of amorphous Gd and the perpendicular anisotropy of ErCo compositionally modurated films, have been found.We have also developed a new magnetooptical recoding material for ultra high density optical disk storages using short wavelength laser. Nd alloy/Tb alloy aouble layer films showed Kerr rotation lager than TbFe and the magnetization perpendicular to the film plane.