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MBE GROWTH OF MAGNETIC NANO-WIRES ON OFF-CUT SUBSTRATES AND ITS APPLICATION TO MAGNETIC NANO-DEVICES

磁性纳米线在切边基底上的MBE生长及其在磁性纳米器件中的应用

基本信息

批准号：
09450127
负责人：
IWATA Satoshi
金额：
$ 10.05万
依托单位：
NAGOYA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09450127/
关键词：
SCANNING TUNNELING MICROSCOPE MAGNETIC NANO-WIRE SURFACE MAGNETISM INTERFACE MAGNETIC ANISOTROPY MAGNETIC ULTRA -THIN FILMS MAGNETO-ELASTIC ANISOTROPY KERR ROTATION MAGNETIC EXCHANGE COUPLING

项目摘要

Magnetic anisotropy in MBE grown Co/Pt superlattices were investigated. The films were epitaxially grown on MgO (100) and (111) substrates as MgO (100), [010]//Ag, Co/Pt (100), [010] and MgO (111), [110]//Ag, Co/Pt [110], respectively. The perpendicular anisotropy were strongly dependent on the film orientation. Structural analysis by RHEED revealed the existence of a large tensile strain in the Co plane of the (100) films. The (100) films exhibit larger negative volume anisotropy compared to the (111) films, which is explained by the magnetoelastic effect through the positive magnetostriction constant λィイD2100ィエD2 of fcc Co. The large magnetocrystalline anisotropy was found by the analysis of the anisotropy energy in the film plane. The (100) and (111) films showed in-plane anisotropy with four fold and six fold symmetry, respectively and their values were considerably enhanced with decreasing Co thickness in Co/Pt superlattices.PtィイD250ィエD2CoィイD250ィエD2 alloy films have been grown by MBE method onto heated MgO (100) and (111) substrates. It is found that the film with CuPt type structure is grown onto (111) substrate at a temperature of 300゜. Whereas, the crystal structure of the films grown onto (111) substrate at 500゜ and onto (100) substrate at 300゜ and 400゜ becomes PtCo ordered phase with AuCu structure. The film of the CuPt type exhibits a very large perpendicular magnetic anisotropy of 1.0×10ィイD16ィエD1 J/mィイD13ィエD1, due to the layered structure along the film normal direction. The spectrum of Kerr rotation θィイD2kィエD2 of the film with CuPt structure is considerably different from that of AuCu structure, not exhibiting a maximum around 4.0 eV but takes a peak at 1.4 eV.

研究了分子束外延生长的Co/Pt超晶格的磁各向异性。在MgO（100）和（111）衬底上分别外延生长了MgO（100），[010]//Ag，Co/Pt（100），[010]和MgO（111），[110]//Ag，Co/Pt [110]薄膜。垂直各向异性强烈依赖于薄膜的取向。通过RHEED的结构分析揭示了在（100）膜的Co平面中存在大的拉伸应变。与（111）薄膜相比，（100）薄膜表现出更大的负体积各向异性，这可以通过fcc Co的正磁致伸缩常数λ_（100）D_（2100）D_（2）来解释，并通过对薄膜平面内各向异性能的分析发现了较大的磁晶各向异性。（100）和（111）薄膜分别表现出四重和六重对称的面内各向异性，并且在Co/Pt超晶格中，随着Co厚度的减小，其值显著增大。结果表明，在300 ℃下，在（111）衬底上生长的薄膜具有CuPt型结构。而在500 ℃和300 ℃、400 ℃下生长在（111）衬底上的薄膜晶体结构为PtCo有序相，具有AuCu结构。CuPt型膜由于沿膜法线方向沿着的层状结构而表现出非常大的垂直磁各向异性，为1.0×10 ~（-1）J/m ~（-1）D ~（16）J/m ~（-1）D ~（13）J/m ~（-1）D。CuPt结构薄膜的Kerr转动谱θ_（？）D_（2k）_（？）D_（2）与AuCu结构薄膜的Kerr转动谱有很大不同，在4.0eV附近没有出现最大值，而是在1.4eV处出现一个峰值。