Domain Wall Displacement Detection Mini Disc with Land/Groove Recording Applied to Mini Disc Systems

Abstract

The development reported herein is that of a surface micromachining technology using two SU-8 layers as a structural material. Three different processes are presented and discussed: the first process makes use of a sol-gel as the sacrificial layer; the second process utilizes the SU-8 itself as the sacrificial layer; the third process utilizes silicon dioxide as the first sacrificial layer and the sol-gel as the second sacrificial layer. These three processes are adapted for one structural layer structure. With a two-layer structure and when release is long, the third process is more adapted.

15-Gbit/in2recording on a DWDD disc using a land/groove substrate with a red laser enabled by a side-wall annealing process

“…Since the invention, many related studies have been reported. Fujita et al realized a capacity of 2.0 GB on a 64 mm disc with land/groove recording [2]. They developed a substrate optimizing deep groove geometry in order to obtain a sufficiently wide recording power tolerance.…”