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Research on magnetization structure stability of magnetic thin films

磁性薄膜磁化结构稳定性研究

基本信息

批准号：
17560292
负责人：
FUTAMOTO Masaaki
金额：
$ 2.37万
依托单位：
Chuo University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17560292/
关键词：
magnetic thin films magnetization structure magnetic force microscopy perpendicular recording media Co films single crystal thin films 面内磁気記録媒体磁区構造の熱的安定性面記録密度磁性膜

项目摘要

The influence of temperature on the magnetization structure of Co-alloy recording media is studied by using a magnetic force microscope (MFM). Preparation of epitaxial Co thin films on single crystal substrates is also tried by using an UHV-MBE to investigate the basic magnetic properties of Co thin films with fcc or hcp crystal structure. The following results are obtained.1. The MFM observation resolution is improved up to 15 -20 nm level, by cooling the sample under a vacuum lower than 10^<-4> Pa and by employing low magnetic moment probe-tips.2. The variation of recorded magnetization structure of high-density magnetic recording media, 80 - 110 Gb/in^2 areal density, has been successfully visualized in a temperature range between -100 - 300 C. The difference in magnetization structure variation upon heating between longitudinal and perpendicular recording media has been clarified.3. An analysis technique of MFM data is developed to investigate the nanometer scale variation of magnetization structure.4. Epitaxial Co thin films are prepared on oxide single crystal substrates by using an UHV-MBE and the effects of fcc-buffer layer and the substrate temperature during film deposition on the crystal structure of Co thin film are clarified. It is possible to control the Co thin film either with fcc or hcp crystal structure. The relationship between the magnetic properties and the crystal structure is systematically studied by using the epitaxial Co thin films.5. The above research results were presented as 2 talks in domestic conferences, 3 talks in international conferences, and were submitted as 5 papers to academic journals.

利用磁力显微镜（MFM）研究了温度对Co-alloy记录介质磁化结构的影响。用UHV-MBE在单晶基底上制备外延Co薄膜，研究了fcc或hcp晶体结构的Co薄膜的基本磁性能。得到了以下结果：通过在低于10^<-4> Pa的真空条件下冷却样品并采用低磁矩探针头，MFM观测分辨率提高到15 -20 nm。在-100 ~ 300℃的温度范围内，成功地可视化了80 ~ 110 Gb/in^2面密度的高密度磁记录介质所记录的磁化结构变化，阐明了纵向和垂直记录介质加热时磁化结构变化的差异。开发了一种MFM数据分析技术，用于研究磁化结构在纳米尺度上的变化。利用UHV-MBE在氧化物单晶衬底上制备了Co外延薄膜，并研究了fcc缓冲层和衬底温度对Co薄膜晶体结构的影响。用fcc或hcp晶体结构控制Co薄膜都是可能的。利用外延钴薄膜系统地研究了磁性能与晶体结构的关系。上述研究成果在国内会议上发表2次，在国际会议上发表3次，在学术期刊上发表论文5篇。