Magneto-optical recording medium and manufacturing method thereo

Stock material or miscellaneous articles – Composite – Of inorganic material

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

428694SC, 428694LE, 428694GT, 428694MT, 428694RE, 428494MM, 428694EC, 428900, 369 13, G11B 566

Patent

active

059686782

ABSTRACT:
In magneto-optical recording medium, on a transparent substrate of polycarbonate resin, an SiN film having the thickness of 600 to 800 .ANG. and surface roughness Rmax of at most 10 nm is formed. On the SiN film, a GdFeCo reading layer having the thickness of 800 to 1200 .ANG. with Gd content of 30 to 36 at. % and Co content of 12 to 50 at. % is formed. On the reading layer, a TbFeCo recording layer of which Co content is 10 to 16 at. % is formed. The recording layer is a perpendicular magnetization film, and the reading layer is an in-plane magnetization film. At the time of reading, the reading and recording layers are heated, and the direction of magnetization of the recording layer is transferred to the reading layer only in the prescribed heated area. Information can be read only from the transferred portion, and thus a super resolution effect is obtained. When Kerr rotation angle .theta..sub.K is measured for the light reflected from the reading layer while the temperatures of the reading and recording layers are elevated, .theta..sub.K is approximately in proportion to Cth power of the elevated temperature t, wherein C is at least 8.0.

REFERENCES:
patent: 4925742 (1990-05-01), Sugawara et al.
patent: 5334424 (1994-08-01), Hani et al.
patent: 5428585 (1995-06-01), Hirokane et al.
patent: 5428586 (1995-06-01), Kobayashi et al.
patent: 5452272 (1995-09-01), Murukami et al.
patent: 5563852 (1996-10-01), Murakami et al.
patent: 5612131 (1997-03-01), Bojarczuk et al.
patent: 5663935 (1997-09-01), Nishimura
patent: 5666346 (1997-09-01), Nishimura
patent: 5736265 (1998-04-01), Tanaka et al.
Nikkei Electronics, 1993; 7-5, No. 585, pp. 163-170.
SPIE vol. 1316, Optical Data Storage, 1990, pp. 271-277.
JJAP Series 6, Proc. Int. Symp. on Optical Memory, 1991, pp. 203-210.
Optical Data Storage, 1994, Technical Digest Series vol. 10, pp. 128-129.
Technical Study Report of the Institute of Electronics, Information and Communication Engineers, Mar. 1, 1996.
Magneto Optical Recording International Symposium--96, Apr. 29-May 2, 1996.
1996 Digests of Intermag '96, Apr. 9-12, 1996.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Magneto-optical recording medium and manufacturing method thereo does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Magneto-optical recording medium and manufacturing method thereo, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magneto-optical recording medium and manufacturing method thereo will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-2053584

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.