Investigation on high recording density magnetic contact duplication using patterned master media

为了在高密度大容量硬盘上高速、低成本地写入高质量的伺服信号，研究了一种诺氏磁接触复制方法（图案主磁接触复制方法）。结果如下：1。通过实验和计算机仿真，阐明了主从间距和复制磁场方向对磁接触复制特性的影响。与传统磁头记录方法相比，该方法的间距损耗系数要低得多。在主平面内和主平面外的倾斜磁场情况下，对主方向图的倾斜磁场都恶化了重复特性。这一结果对新一代伺服方法之一的相位伺服模式有一定的参考价值。通过放大模型的仿真和实验，研究了主介质和复制从介质的磁化分布、复制条件与输出和波形等再现特性的关系。通过这些研究，除了可以推断出主、从介质的磁化分布外，还可以推断出主介质的退磁因子。此外，还阐明了重复场强和主结构对再现波形的影响。采用放大模型和三维有限元方法对垂直磁记录硬盘的磁复制进行了基础研究。结果表明，在磁盘平面上施加重复场的边缘打印比在垂直于磁盘平面的方向上施加重复场的位打印更有利。

In order to write a high quality servo signal at high speed and low cost on high density and large capacity hard disks, a nobel magnetic contact duplication method (patterned master magnetic contact duplication method) was investigated. The results are as follows.1. The influence of the spacing between master and slave and that of the direction of the magnetic field for duplication on magnetic contact duplication characteristics were clarified by using experiments and computer simulation. The values of the spacing loss factors were much lower than the conventional magnetic head recording. The oblique magnetic field to the master pattern deterioreted the duplication characteristics in both cases of oblique fields in the master plane and out of one. This result is useful for the phase servo pattern which is considered one of next generation servo methods.2. Magnetization distribution of master media and duplicated slave media, the relation between duplication condition and reproduced characteristics such as output and waveform were studied by simulation and experiment using enlarged models. From these studies, besides magnetization distribution in the master and slave media, demagnetizing factor of the master media could be inferred. Moreover, the influence of duplication field strength and master structure on reproduced waveform was clarified.3. Basic studies on magnetic duplication for perpendicular magnetic recording hard disks were performed with enlarged models and 3-dimentional finite element method. It was found that edge printing in which duplication field is applied in the disk plane is more advantageous than bit printing in which duplication field is applied in a direction perpendicular to the disk plane.