"STUDY OF STRUCTRE AND PROPERTY OF MAGNETIC FILMS MADE WITH M.B.E."

“M.B.E. 磁性薄膜的结构和性能研究”

• 批准号: 09650765
• 负责人: MASUDA Masataka
• 金额: $ 2.18万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650765/
• 关键词: MBE METHOD; ARTIFICIAL LATICE FILMS; Pt-Co MULTI-LAYER FILMS; MAGNETIC DOMAIN STRUCTURE; M.F.M; 人口格子膜

I made artificial lattice films of Pt/Co with the MBE.I valued the effect of the growth speed and the substrate temperature on the film structure by the "in situ" RHEED analysis, and I decided a suitable film formation condition. For the formation films on silicon (Ill) substrate, it was valued as a suitable condition to make Pt layer of 20 nm thickness, of 473K temperature as a buffer layer. I evaluated the boundary strain and the consistency of films with the precise measurements of AFM on surface structure of films. By the thin film X-ray diffraction, I evaluated fine structure of films and I attempted, to quantify the stacking property of films as an artificial lattice. With XPS analysis, which is connected with ultra high vacuum tunnel to MBE chamber, I made sure the composition modulation of nm order period that is formed normal directions to the film. The result of VSM measurement showed that the period of artificial lattice and formation condition of films affect the magnetic characteristic. By observation of magnetic domain structure with MFM, I found that domain size decreases with the increasing of Co layer thickness. We explained this phenomenon with the evaluation of magnetic energy as sum of static magnetic energy and magnetic wall energy. We calculated static magnetic potential distribution with BEM for the magnetic domains with magnetic wall of 90 degree and 45 degree. We compared the result of MFM with the calculated value arid discussed magnetic domain structure of artificial lattice films.We improved the Hall magnetic measurement device to measure giant magnetic resistivity in 5kOe magnetic field. We confirmed that boundary structure of films affects magnetic characteristic. We discussed the magnetic characteristic of the granular structure films prepared with sputtering device. We evaluated the magnetic characteristic and X-ray diffraction profile under the alternation of boundary structure by the annealing.

用MBE制备了Pt/Co的人工晶格薄膜。我通过“原位”RHEED分析，评价了生长速度和衬底温度对薄膜结构的影响，并确定了合适的薄膜形成条件。对于在硅（Ill）衬底上形成薄膜，认为在473K温度下制作厚度为20nm的Pt层作为缓冲层是合适的条件。利用原子力显微镜对薄膜表面结构的精确测量，评价了薄膜的边界应变和一致性。通过薄膜x射线衍射，我评估了薄膜的精细结构，并试图量化薄膜作为人工晶格的堆叠特性。通过XPS分析，将超高真空隧道连接到MBE室，确定了与薄膜形成法向的nm阶周期的成分调制。VSM测量结果表明，人工晶格周期和膜的形成条件对磁性特性有影响。通过MFM对磁畴结构的观察，发现磁畴尺寸随着Co层厚度的增加而减小。我们用静态磁能和磁壁能的总和来解释这一现象。用边界元法计算了磁壁为90度和45度的磁畴的静态磁势分布。将MFM结果与计算值进行了比较，讨论了人工晶格薄膜的磁畴结构。我们改进了霍尔测磁装置，在5kOe磁场中测量巨磁电阻率。我们证实了薄膜的边界结构会影响其磁性。讨论了用溅射装置制备的颗粒结构薄膜的磁性特性。我们评价了退火后边界结构变化下的磁性和x射线衍射谱。