Study on the initial stage of thin film growth to control the structure of hetero-interface on the atomic level

薄膜生长初始阶段原子水平控制异质界面结构的研究

• 批准号: 06452325
• 负责人: YAMAMOTO Ryoichi
• 金额: $ 4.74万
• 依托单位: Institute of Industrial Science
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06452325/
• 关键词: MEAM; surfactant epitaxy; metallic multilayr; perpendicular magnetic anisotropy; giant magnetoresistance effect; 金属多層膜

It is predicted by first-principles theory that Au/Co-Fe metallic multilayr will・show a large perpendicular magnetic anisotropy. Then this system was actually prepared by molecular beam epitaxy method and it is confirmed that the perpendicular magnetic anisotropy energy of this system is actually larger than Au/Co multilayr.Metallic multilayr is an artificial material which is fabricated by alternate deposition of a few kinds of different metals. Metallic multilayrs show some interesting properties suoh as perpendicular magnetic anisotropy and giant magnetoresisitance. They are good candidates for high-density magneto-optical recording media. The existence of hetero-interface, i.e.interface between different metals, is responsible for these interesting physical properties.We have calculated the perpendicular magnetic anisotropy energies of metallic multilayrs. It has been clarifed that both interface anisotropy and strain-induced anisotropy are responsible for perpendicular magnetic anisotropy. It is also found that the interface anisotropy can be expressed as a function of the number of valence electrons in the system. In particular, it is predicted that a Au/Co-Fe multilayr will exhibit a large perpendicular magnetic anisotropy of about 2 meV/unit cell This system was actually prepared by molecular beam epitaxy method. It was confirmed that the perpendicular magnetic anisotropy of this system is larger than that of Au/Co. This result suggests the possibility of controlling the magnetic anisotropy by changing the number of valence electrons.

第一性原理预测，Au/Co-Fe金属多层膜将表现出较大的垂直磁各向异性。然后用分子束外延方法实际制备了该系统，证实了该系统的垂直磁各向异性能实际上大于Au/Co多层膜。金属多层膜是由几种不同金属交替沉积而成的人工材料。金属多层膜具有垂直磁各向异性和巨磁阻等有趣的性质。它们是高密度磁光记录介质的良好候选者。异质界面的存在，即不同金属之间的界面，是导致这些有趣的物理性质的原因。我们计算了金属多层膜的垂直磁各向异性能。结果表明，界面各向异性和应变感生各向异性是导致垂直磁各向异性的主要原因。研究还发现，界面各向异性可以表示为系统中的价电子数的函数。特别地，预测了Au/Co-Fe多层膜将表现出约2 meV/晶胞的大的垂直磁各向异性。结果表明，该体系的垂直磁各向异性大于Au/Co体系的垂直磁各向异性，这表明了通过改变价电子数来控制磁各向异性的可能性。

项目成果

K.Kyuno, J.-G.Ha, R.Yamamoto and S.Asano: "The-oretical study on the Co layr thickness dependence of the magnetic anisotropy of Pd/Co multilayrs" Solid State Commun. (accepted).

K.Kyuno、J.-G.Ha、R.Yamamoto 和 S.Asano：“Pd/Co 多层磁各向异性的 Co 层厚度依赖性的理论研究”Solid State Commun。

Kazuki MAE: "Microscopic mechanisum of the surfactant epitary by molecular dynamics" Modelling and Simulation in Materials Science and Engineering. 4. 73-85 (1996)

Kazuki MAE：“通过分子动力学研究表面活性剂外延的微观机制”材料科学与工程中的建模与模拟。

Kentaro KYUNO: "Perpendieular magnetic anisotropy of metallic multilayers composed of magnetic layers only: Ni/Co and Ni/Fe multilayers" Japanese Journal of Applied Physics. (accepted).

Kentaro KUNO：“仅由磁性层组成的金属多层的垂直磁各向异性：Ni/Co 和 Ni/Fe 多层”日本应用物理学杂志。

弓野健太郎: "電子構造から見た金属人工格子の垂直磁気異方性" 日本金属学会会報. 33. 1197- (1994)

Kentaro Yumino：“从电子结构看金属人工晶格的垂直磁各向异性”日本金属研究所通报33. 1197-（1994）。

伊坪徳宏: "微細構造制御によるユコマテリアル化の試みとしてのFe-Feコンポジットの可能性" 粉体および粉末冶金. 41. 1361- (1994)

Norihiro Itsubo：“Fe-Fe 复合材料作为通过微观结构控制制造 yukomaterials 的可能性”粉末和粉末冶金学 41. 1361- (1994)。