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

稀土-铁族多元非晶薄膜性能及应用研究

基本信息

批准号：
60420034
负责人：
UCHIYAMA Susumu
金额：
$ 14.91万
依托单位：
NAGOYA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (A)
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1988
项目状态：
已结题

项目摘要

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.

为了从根本上了解稀土-铁族过渡金属(RE-TM)非晶薄膜的磁性和磁光性质，对其进行了系统的研究。从应用的角度来看，也开发了高质量的磁光记录材料。1.系统地测量了各种RE-Tm薄膜的磁光谱，并根据能带结构对其进行了解释。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蚀性的提高和发展。4.利用人工超晶格诱导垂直磁各向异性。本研究最重要的结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和系统地证明了4f电子对磁光效应的贡献。对于垂直各向异性和磁致伸缩，系统的研究还有待于进一步的实验，但已经发现了一些有趣的结果，如非晶态Gd的磁致伸缩和成分调制ErCo薄膜的垂直各向异性。我们还开发了一种用于超高密度光盘存储的短波长激光磁光记录材料。Nd合金/Tb合金双层膜的克尔旋转比TbFe大，磁化强度垂直于膜平面。