Recently, in the magnetic recording, head assisted magnetic recording (HAMR) and patterned media (PM) technology
have been considered as strong candidates to achieve the high recording density beyond the super-paramagnetic limit.
Using E-beam recording (EBR) and UV nano-imprinting, the PM with nano-scale pitches and tracks is fabricated
effectively and delicately. And the optical throughput of the HARM system is improved by optimizing the grating and
the media geometry. In the optical storage, next generation technologies are the near filed recording (NFR) and the
holographic recording. The modified NFR gap servo mechanism is developed and clearance of 30nm is uniformly
maintained. In addition, the anti-shock servo algorithm resists against the external shock of over 2G@10ms. The
advanced holographic system compensates the errors from disturbance by finding the max intensity angle with back
propagation algorithm for angle direction and shifting the reference beam with glass plate controlled by a servo motor for
The optical systems using the probe and solid immersion lens (SIL) have been researched as the technology to embody the near field recording (NFR) system. In NFR system, it is very important for the clearance between slider and disk surface to remain under 100nm in order to use effect on evanescent wave. The OFH should also have a small pitch to control the contamination effect. Because the larger the gap between leading edge of slider and disk is, the more particles come into SlL. As a result, they have a lot of bad influence on SIL. However, the flying stability turns bad as the pitch angle becomes small. Accordingly, it is necessary to consider dynamic characteristics in OFH ABS design.
This research made two approximation models through the regression analysis and neural network, which are the parameter analysis based on optimization techniques. This study also used micro-genetic algorithm (GA) and design optimization tool (DOT). ABS shape of flying head was optimized with the object of remaining FH of several ten nano meter in static state. And the dynamic optimization was carried out toward decreasing FH modulation.
As a result of static optimization, the flatness of flying height was restricted within 1% in inner diameter (ID) and outer diameter (OD). Besides, the flying height was remained about 50nm. In the dynamic optimization, the vertical sensitivity of dynamic optimal model was bigger than that of original model and the pitch sensitivities was also improved a bit.