Design and characterization of a quadrilayer magneto-optic disk

Author

McDaniel, T.W. ; Finkelstein, B.I. ; Williams, W.C.

Author_Institution

IBM Corp., Tucson, AZ, USA

Volume

24

Issue

6

fYear

1988

fDate

11/1/1988 12:00:00 AM

Firstpage

2467

Lastpage

2469

Abstract

The use of quadrilayer film structures can maximize the magnetooptic (MO) effect in reflected light used for readout in optical data storage. A computer program and a multifilm optical model have been utilized to search for optimized quadrilayer structures based on various figures of merit (FOMs), including differential MO signal, shot-noise-limited SNR, and SNR expressions arising from other noise sources. Selection among various FOMs allows tradeoffs relative to the magnitude of the reflectance or thermal efficiency in writing. Disks were fabricated on the basis of the simulation design rules, and experiments were conducted to assess the recording performance. The authors report on the optimization search used in the design program and the formation of the associated FOMs, and they present data on signal and noise to illustrate the value of the model

Keywords

magneto-optical recording; optical disc storage; SNR expressions; characterization; computer program; design; design program; differential MO signal; experiments; figures of merit; magneto-optic disk; magnetooptic effect; multifilm optical model; optimization search; optimized quadrilayer structures; quadrilayer film structures; readout in optical data storage; recording performance; reflectance; reflected light; shot-noise-limited SNR; signal to noise ratio; simulation design rules; thermal efficiency in writing; tradeoffs; Design optimization; Disk recording; Magnetooptic effects; Memory; Noise figure; Optical computing; Optical films; Optical noise; Reflectivity; Signal to noise ratio;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.92143

Filename

92143