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IMPROVED SIGNAL MAGNITUDE, FOCUS AND TRACKING CHARACTERISTICS IN MAGNETO-OPTIC MEDIA

IP.com Disclosure Number: IPCOM000024957D
Original Publication Date: 1983-Feb-28
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 103K

Publishing Venue

Xerox Disclosure Journal

Abstract

An enhancement in the magnitude of the signal produced from a thin magneto-optic (MO) medium can be obtained by the addition of a thin overlayer of tellurium or tellurium alloy as shown in Figure 1. For simplicity, a single layer medium is disclosed although the enhancement to be described may be applied to multilayer structures, e.g., quadrilayers that provide interference enhancement. The MO medium 10 comprises a suitable substrate 12, such as aluminum or plastic having a reflecting surface. The magnetic media layer 14 is deposited on substrate 12 followed by thin tellurium or tellurium alloy overlayer 16. As an exapple, layer 14 may be in the range of 5 to 100 nm while overlayer 16 may about 100A.

This text was extracted from a PDF file.
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Page 1 of 2

I =ROX DISCLOSURE JOURNAL

IMPROVED SIGNAL MAGNITUDE, FOCUS AND TRACKING CHARACTER.ISTICS IN M AGNETO-OPTIC N1 EDIA
Richard Johnson
C. Neville Connell

Proposed Classification US. C1. 346/135.1
Int. (31. Gold 15/00

VISUAL PORT

/8,

-+I I

SUBSTRATE

RECORDED LY L A c I T E AGN M FIG. I

REGION

 SIGNAL STRENGTH

C

LASER BEAM

DISTRIBUTION

0

READ b-SlTE AXIS

1 SCGNAL FIG 2 18

X

FIG 3

Volume 8 Number 1 January/February 1983 31

[This page contains 1 picture or other non-text object]

Page 2 of 2

IMPROVED SIGNAL MAGNITUDE, FOCUS AND TRACKING CHARACTERISTICS IN MAGNETO-OPTIC MEDIA (Cont'd)

An enhancement in the magnitude of the signal produced from a thin magneto- optic (MO) medium can be obtained by the addition of a thin overlayer of tellurium or tellurium alloy as shown in Figure 1. For simplicity, a single layer medium is disclosed although the enhancement to be described may be applied to multilayer structures, e.g., quadrilayers that provide interference enhancement. The MO medium 10 comprises a suitable substrate 12, such as aluminum or plastic having a reflecting surface. The magnetic media layer 14 is deposited on substrate 12 followed by thin tellurium or tellurium alloy overlayer 16. As an exapple, layer 14 may be in the range of 5 to 100 nm while overlayer 16 may about 100A.

If, prior to the MO writing process, apertures 18 are ablated in the overlayer 16, a well defined site or port 18 is formed in the overlayer and is available for magnetic information storage at points 20 in magnetic layer 14 with a sharp boundary limited by the tellurium hole edge 22. Thus, recording and playback is accomplished at the m...