Investigation of Laminated High Saturation Magnetic Films on Sloping Surfaces & High Data Rate Magnetic Recording

倾斜表面上层压高饱和磁性薄膜的研究

• 批准号: 9710223
• 负责人: Shan Wang
• 金额: $ 19.18万
• 依托单位: Stanford University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-10-01 至 2000-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9710223&HistoricalAwards=false
• 关键词: Investigation; Laminated; Saturation; Magnetic; Films; Investigation; Laminated; Saturation; Magnetic; Films

9710223 Shan Wang It is anticipated that the date rate of hard disk drives will be ~ 100 MB/s in the beginning of the new millennium, corresponding to recording frequencies of 300-450 Mhz. This will be a daunting engineering and scientific feat because it requires new recording head materials and pathbreaking device innovations. In particular, magnetic write heads must operate effectively at 300-450mhz, and write field rise time needs to be ~ 0.4 ns, close to the magnetization rotation speed limit. Laminated high saturation magnetic films are very important to high density, high data rate magnetic recording heads, However, the field rise time of the most advanced recording head is ~ 2 ns, too large for use in a data rate of 100 MB/s. Furthermore, the soft magnetic properties and permeability of the magnetic materials degrade significantly once the write heads are fabricated, presumably at the sloping areas of the device. The low frequency leads to the necessity of using large write currents without helping the field rise time. The objectives of the proposed research are to understand and avoid the degradation of soft magnetic properties of high saturation magnetic film when fabricating recording heads, and to investigate the fundamentals of high data rate recording as related to laminated FeRhN/AIN films, and extremely small field rise time and nonlinear transition shift. It is proposed to investigate high saturation, high permeability, corrosion resistant, and magnetically soft laminated FeRhN/AIN films, particularly when sputter deposited on sloping surfaces, and to incorporate these new materials into a prototype magnetic write head with a field rise time of 1 ns so that an unprecedented date rate of 100 MB/s can be realized. The proposed research will provide new knowledge on how crystal texture and perpendicular anisotropy of FeRhN films evolve under oblique incidence and how desired texture and soft magnetic properties can be achieved by understanding processing-m icrostructure-property correlation. Microstructural characterizations of magnetic films on sloping surfaces by synchrotron X-ray radiation diffraction and cross sectional TEM are very powerful techniques which can find wide acceptance in magnetic solid state device research. Magnetic recording heads with data rates as high as 100 MB/s will greatly advance the state of the art of modern computing and telecommunication. The proposal has a mixture of scientific investigation and technological innovation, and will greatly help the related education program as well.

9710223 Shan Wang预计硬盘驱动器的日期速率将在新千年开始时约100 mb/s，对应于记录频率为300-450 MHz。 这将是一项艰巨的工程和科学壮举，因为它需要新的录音头材和破坏性设备创新。 特别是，磁性写头必须在300-450MHz处有效地运行，并且写入场的上升时间必须为〜0.4 ns，接近磁化旋转速度极限。 层压的高饱和度磁性膜对于高密度，高数据速率磁记录头非常重要，但是，最先进的记录头的田间上升时间〜2 ns，太大，无法在100 MB/s的数据速率中使用。 此外，一旦制造出写头（大概是在设备的倾斜区域），磁性材料的软磁性和磁性材料的渗透性就会显着降解。 低频导致需要使用大型写入电流而无需帮助场上增加时间。 拟议的研究的目标是理解和避免在制造记录头时高饱和磁性膜的软磁性能的降解，并研究与层压的Ferhn/ain膜相关的高数据速率记录的基本原理，以及极小的田间上升时间和非线性过渡转移。提议研究高饱和度，高渗透性，耐腐蚀性和磁性柔软的层压板的Ferhn/ain膜，尤其是当溅射沉积在倾斜表面上时，并将这些新材料纳入原型磁性写入头中，并以1 ns的范围上升时间为1 ns，以便于100 mb/s均可实现100 ns的速率。 拟议的研究将提供有关Ferhn膜在倾斜发生率下进化的晶体质地和垂直环形的新知识，以及如何通过理解加工-M iCrostructure-Property相关性来实现所需的纹理和软磁性能。 通过同步加速器X射线辐射衍射和横截面TEM对倾斜表面上磁性膜的微结构表征是非常强大的技术，可以在磁性固态设备研究中找到广泛的接受。 数据速率高达100 Mb/s的磁记录头将大大推动现代计算和电信的最新状态。 该提案结合了科学研究和技术创新，也将极大地帮助相关的教育计划。