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

小行星9710223 预计在新千年开始时，硬盘驱动器的数据速率将达到~ 100 MB/s，对应于300-450 Mhz的记录频率。 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料和开创性的设备创新。 特别地，磁写入头必须在300- 450 mhz下有效地操作，并且写入场上升时间需要为~ 0.4ns，接近磁化旋转速度极限。 叠层高饱和磁性薄膜对于高密度、高数据速率的磁头是非常重要的。然而，最先进的磁头的磁场上升时间为~ 2ns，对于100 MB/s的数据速率来说太大。 此外，一旦写入头被制造，磁性材料的软磁性能和磁导率显著降低，大概在设备的倾斜区域处。 低频率导致必须使用大的写入电流而无助于场上升时间。 所提出的研究的目的是了解和避免高饱和磁性膜的软磁性能的退化时，制造记录头，并调查的基本原理的高数据速率记录相关的叠层FeRhN/AlN薄膜，和极小的场上升时间和非线性过渡偏移。建议调查高饱和度，高磁导率，耐腐蚀，和磁性软层压FeRhN/AlN薄膜，特别是当溅射沉积在倾斜的表面上，并将这些新材料纳入一个原型的磁写头的磁场上升时间为1 ns，使前所未有的数据速率为100 MB/s可以实现。 拟议的研究将提供新的知识倾斜入射下的FeRhN薄膜的晶体织构和垂直各向异性如何演变，以及如何通过理解加工-微观结构-性能相关性来实现所需的织构和软磁性能。 利用同步辐射X射线衍射和截面透射电镜对倾斜表面上磁性薄膜的微结构进行表征是一种非常有效的技术，在磁性固体器件的研究中得到了广泛的应用。 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技术的发展。 该方案集科学研究与技术创新于一体，对相关教育项目的实施也有很大的帮助。

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.