Approach to readout aperture control for magnetic super-resolution readout

Citation
H. Fuji et al., Approach to readout aperture control for magnetic super-resolution readout, IEEE MAGNET, 35(3), 1999, pp. 2047-2052
Citations number
9
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
IEEE TRANSACTIONS ON MAGNETICS
ISSN journal
0018-9464 → ACNP
Volume
35
Issue
3
Year of publication
1999
Part
2
Pages
2047 - 2052
Database
ISI
SICI code
0018-9464(199905)35:3<2047:ATRACF>2.0.ZU;2-U
Abstract
An approach of readout aperture control for magnetic super-resolution (MSR) readout is described. In order to detect the size of a readout aperture ge nerated by a focused laser beam on an MSR disk, a new mark pattern consisti ng of short and long marks was recorded. An amplitude ratio of the readout signals between the short and the long marks is proportional to the apertur e size. By maintaining the ratio constant by adjusting the laser power, the aperture size can be fixed. This technique makes it possible to reproduce data with a low bit error rate (BER). The sensitivity of the ratio to the r eadout power deviation and the distribution of the ratio were evaluated in order to estimate the accuracy of the readout power control. This technique is also applicable to readout when the disk is tilted. When the aperture s ize was maintained by this method, BER was found to be substantially reduce d. Consequently, this new technique can realize high density recording on t he MSR disk, This is the first approach to readout aperture control based o n controlling the laser power.