High-density perpendicular magnetic recording media of granular-type (FePt/MgO)/soft underlayer
High-density perpendicular magnetic recording media of granular-type (FePt/MgO)/soft underlayer
复制标题
粒状（FePt/MgO）/软底层的高密度垂直磁记录介质
DOI：
10.1109/tmag.2004.838073
复制
发表时间：
2005
影响因子：
2.1
通讯作者：
H. Osawa
中科院分区：
文献类型：
--
作者：
T. Suzuki;Zhengang Zhang;A. K. Singh;Jinhua Yin;A. Perumal;H. Osawa
在Fe-Ta-C软磁底层（SUL）上制备了由颗粒型FePt-MgO薄膜组成的垂直磁记录介质。[001]对FePt/MgO多层膜进行退火处理，得到了具有高垂直磁各向异性的FePt织构颗粒膜。FePt晶粒尺寸、垂直矫顽力、磁活化体积和FePt晶粒之间的交换耦合与初始多层结构和退火条件密切相关。用自旋台对磁盘的记录性能进行了评价。所得结果表明，记录性能与磁性能之间有密切的关系。采用高温磁力显微镜（MFM）技术研究了颗粒型FePt介质在25/spl°C-200/spl°C温度范围内的热稳定性。估计信号在高温下的衰减归因于温度相关的磁各向异性行为。
Perpendicular magnetic recording media, composed of granular-type FePt-MgO films on Fe-Ta-C soft magnetic underlayer (SUL), have been fabricated on to 2.5-in glass disks. [001] textured FePt granular films with high-perpendicular magnetic anisotropy were obtained by annealing the FePt/MgO multilayer films. The FePt grain size, perpendicular coercivity, magnetic activation volume, and the exchange coupling between the FePt grains were found to be strongly dependent on the initial multilayer structures and the annealing conditions. The recording performance of the disks was evaluated by a spin-stand. The obtained results reveal a close correlation between the recording performance and magnetic properties. The thermal stability of the granular-type FePt media was studied using high-temperature magnetic force microscopy (MFM) technique, equipped with in situ sample heating, in the temperature range 25/spl deg/C-200/spl deg/C. The estimated signal decay at high temperature is ascribed to the temperature dependent magnetic anisotropy behavior.