The Effects of third Element for Hexagonal Ferrite Thin Films for High Density Magnetic Recording Medium with small grains

第三元素对小晶粒高密度磁记录介质六方铁氧体薄膜的影响

• 批准号: 12450124
• 负责人: MORISAKO Akimitsu
• 金额: $ 3.52万
• 依托单位: Shinshu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12450124/
• 关键词: perpendicular recording; hexagonal ferrite thin film; thin film recording media; sputtering; Barium ferrite; Strontium ferrite; magnetic recording; high density recording; 非晶質下地層; 窒化アルミ; 酸化アルミ下地層; スパッタ; 酸化物薄膜; 磁気記録媒体; 超高密度記録媒体; 垂直記録媒体; スパッ

For an ultra high density perpendicular magnetic recording, the media should have chemical stability, mechanical durability, moderate hard magnetic properties, and small grains. In this study, the effects of third element and under-layer for sputtered hexagonal ferrite thin films on crystallographic characteristics, magnetic properties, and morphological structure were studied. It was found that Bi addition was effective to reduce the grain size and coercivity was about 3.7 kOe. The linear recording density for this film was 210 to 230 kfrpi. In perpendicular recording media, it is very important to prepare the film with perpendicular orientation of magnetic easy axis, which is c-axis in hexagonal ferrite. To promote c-axis orientation, hexagonal A1N with c-axis perpendicular orientation was used as an under-layer. The gain size was reduced to about 40 ma and coercivity as high as 4.3 kOe was obtained, while diffusion of N into hexagonal ferrite layer was found. New under-layer of amorphous aluminum oxide was used for the reduction of grain size and for the magnetically grain isolation. It was found that amorphous aluminum uader-layer could reduce the grain to 20 im and coercivity of this film was about 4 kOe. Magnetic coupling of this film was magneto-static and magnetic cluster size, which was evaluated from MFM observation, was about 40 nm.

对于超高密度垂直磁记录，介质应具有化学稳定性、机械耐久性、中等硬磁特性和小晶粒。本研究主要探讨第三元素及基底层对溅镀六角晶系铁氧体薄膜之结晶特性、磁性及形貌结构之影响。结果表明，Bi的加入有效地减小了晶粒尺寸，其矫顽力约为3.7kOe。该膜的线性记录密度为210至230 kfrpi。在垂直记录介质中，制备与六方晶系铁氧体的易磁化轴（c轴）垂直取向的薄膜是非常重要的。为了促进c轴取向，使用具有c轴垂直取向的六方AlN作为底层。增益尺寸减小到40 mA左右，磁饱和度高达4.3 kOe，同时发现N向六角铁氧体层中扩散，并采用新的非晶氧化铝底层来减小晶粒尺寸和实现磁晶粒隔离。结果表明，非晶铝过渡层可使薄膜晶粒减小到20 μ m，薄膜的矫顽力约为4kOe。该薄膜的磁耦合为静磁耦合，磁簇尺寸约为40 nm。

项目成果

森迫昭光, 伊藤健太, 瀧澤亜由美, 松本光功: "高密度記録用バリウムフェライト薄膜の薄層化"電気学会マグねティクス研究会資料. MAG-02-2. 7-12 (2002)

Akimitsu Morisako、Kenta Ito、Ayumi Takizawa、Mitsukoshi Matsumoto：“用于高密度记录的钡铁氧体薄膜的减薄”IEEJ MAG-02-2 (2002)。

M. Matsumoto, A. Morisako, S. Takei: "Characteristics of Ba-ferrite thin films for magnetic disk media application"J. of Alloys and compounds. 326. 215-220 (2001)

M. Matsumoto、A. Morisako、S. Takei：“用于磁盘介质应用的Ba-铁氧体薄膜的特性”J。

A. Morisako, T. Naka, K. Ito, A. Takizawa, M. Matsumoto, Y.K. Hong: "Properties of Ba-ferrite/A1N double layered films for perpendicular magnetic recording media"Journal of Magnertism and Magnetic materials. 242-245. 304-310 (2002)

A. Morisako、T. Naka、K. Ito、A. Takizawa、M. Matsumoto、Y.K.

森迫昭光,斉藤誠,松本光功: "高密度磁気記録用Cr添加ストロンチウムフェライトスパック薄膜"電気学会マグネティクス研究会資料. MAG-00-318. 3-7 (2000)

Akimitsu Morisako、Makoto Saito、Mitsuhiro Matsumoto：“用于高密度磁记录的掺铬锶铁氧体旋转薄膜”IEEJ MAG-00-318（2000）。

A.Morisako, T.Naka, K.Ito, A.Takizawa, M.Matsumoto, Y.K.Hong: "Properties of Ba-ferrite/AlN double layered films for perpendicular magnetic recording media"Journal of Magnertism and Magnetic materials. 242-245. 304-310 (2002)

A.Morisako、T.Naka、K.Ito、A.Takizawa、M.Matsumoto、Y.K.Hong：“垂直磁记录介质用Ba-铁氧体/AlN双层薄膜的性能”Journal of Magnertism and Magnetic Materials。