Title :
Magneto-optical recording on Pt/Co and GdFeCo/TbFeCo disks using a green laser
Author :
Kaneko, Masahiko ; Sabi, Yuichi ; Ichimura, Isao ; Hashimoto, Shun-ichi
Author_Institution :
Sony Corp. Res. Lab., Tokyo, Japan
fDate :
11/1/1993 12:00:00 AM
Abstract :
The authors report that the Pt/Co multilayer disk and the GdFeCo/TbFeCo double-layer disk have been investigated for high density magneto-optical recording using a low noise and high power green laser. A high carrier/noise (C/N) ratio of 45 dB at a mark length of 0.4 μm was obtained for both disks with a track pitch of 0.9 μm. The results show the possibility of areal densities more than three times higher than those of current ISO standard magneto-optical disks. The system noise, the short noise, and the disk noise were measured experimentally as a function of frequency in order to investigate how to improve the C/N ratio using a green laser
Keywords :
cobalt; cobalt alloys; gadolinium alloys; iron alloys; magnetic multilayers; magneto-optical recording; platinum; terbium alloys; GdFeCo-TbFeCo; GdFeCo/TbFeCo double-layer disk; Kerr ellipticity; Kerr rotation; Pt-Co; Pt/Co multilayer disk; areal densities; disk noise; high CNR; high density magneto-optical recording; high power green laser; short noise; system noise; Coercive force; Disk recording; Glass; Magnetooptic effects; Magnetooptic recording; Nonhomogeneous media; Phase modulation; Sputtering; Substrates; Temperature;
Journal_Title :
Magnetics, IEEE Transactions on
