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1. (WO2001035396) MAGNETIC MEDIA PATTERNING UTILIZING HEAT-INDUCED PHASE TRANSITION
Latest bibliographic data on file with the International Bureau   

Pub. No.: WO/2001/035396 International Application No.: PCT/US2000/030717
Publication Date: 17.05.2001 International Filing Date: 09.11.2000
Chapter 2 Demand Filed: 01.05.2001
IPC:
G11B 5/00 (2006.01) ,G11B 5/012 (2006.01) ,G11B 5/596 (2006.01) ,G11B 5/74 (2006.01) ,G11B 5/82 (2006.01) ,G11B 5/852 (2006.01) ,G11B 5/855 (2006.01) ,G11B 11/105 (2006.01) ,G11B 13/04 (2006.01)
G PHYSICS
11
INFORMATION STORAGE
B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5
Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
G PHYSICS
11
INFORMATION STORAGE
B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5
Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
012
Recording on, or reproducing or erasing from, magnetic discs
G PHYSICS
11
INFORMATION STORAGE
B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5
Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
48
Disposition or mounting of heads relative to record carriers
58
with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
596
for track following on discs
G PHYSICS
11
INFORMATION STORAGE
B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5
Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
74
Record carriers characterised by the form, e.g. sheet shaped to wrap around a drum
G PHYSICS
11
INFORMATION STORAGE
B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5
Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
74
Record carriers characterised by the form, e.g. sheet shaped to wrap around a drum
82
Disc carriers
G PHYSICS
11
INFORMATION STORAGE
B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5
Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
84
Processes or apparatus specially adapted for manufacturing record carriers
852
Orientation in a magnetic field
G PHYSICS
11
INFORMATION STORAGE
B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5
Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
84
Processes or apparatus specially adapted for manufacturing record carriers
855
Coating only part of a support with a magnetic layer
G PHYSICS
11
INFORMATION STORAGE
B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
11
Recording on, or reproducing from, the same record carrier wherein for these two operations the methods or means are covered by different main groups of groups G11B3/-G11B7/212; Record carriers therefor
10
using recording by magnetisation or demagnetisation
105
using a beam of light or a magnetic field for recording and a beam of light for reproducing, e.g. light-induced thermo-magnetic recording, Kerr effect reproducing
G PHYSICS
11
INFORMATION STORAGE
B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
13
Recording simultaneously or selectively by methods or means covered by different main groups; Record carriers therefor; Reproducing simultaneously or selectively therefrom
04
magnetically and optically
Applicants:
WANG, Li-Ping [--/US]; US (UsOnly)
SEAGATE TECHNOLOGY LLC [US/US]; 920 Disc Drive P.O. Box 66360 Scotts Valley, CA 95067-0360, US (AllExceptUS)
Inventors:
WANG, Li-Ping; US
Agent:
HANKINS, John; McDermott, Will & Emery 600 13th Street, N.W. Washington, DC 20005-3096 , US
Priority Data:
60/165,28412.11.1999US
Title (EN) MAGNETIC MEDIA PATTERNING UTILIZING HEAT-INDUCED PHASE TRANSITION
(FR) FORMATION DE MOTIFS DANS UN SUPPORT MAGNETIQUE, PAR TRANSITION DE PHASE INDUITE PAR LA CHALEUR
Abstract:
(EN) Patterned magnetic media are provided at high resolution and pattern definition by a process comprising steps of: applying to a magnetic layer (4) a first uniform magnetic field (7) of a first direction and strength to pre-align the magnetic grains thereof; applying a second uniform magnetic field of a second, opposite direction and of lesser strength than the first magnetic field, sufficient to change the alignment of the magnetic grains only when the temperature thereof is equal to or greater than the Curie temperature Tc; selectively increasing the temperature of a pattern of selected surface areas (4S) of the magnetic layer to at least Tc for an interval while applying the second magnetic field to thereby selectively change the alignment of the magnetic grains of the selectively heated surface areas; terminating application of the second magnetic field after completion of the selective realignment; and cooling the selectively heated surface areas to a temperature below Tc, whereby the magnetic pattern is preserved in the magnetic layer.
(FR) On produit des supports magnétiques à motif, avec une résolution et une définition de motif élevées, par un procédé qui consiste à : appliquer sur une couche magnétique (4) un premier champ magnétique homogène (7) ayant des premier sens et intensité, de sorte que les grains magnétiques de ladite couche soient pré-alignés ; appliquer un deuxième champ magnétique homogène ayant un deuxième sens opposé et d'intensité suffisamment inférieure à celle du premier champ magnétique pour que l'alignement des grains magnétiques ne soit modifié que lorsque leur température est supérieure ou égale à la température de Curie Tc ; augmenter sélectivement la température d'un motif de zones de surface sélectionnées (4S) de la couche magnétique, de sorte qu'elle atteigne au moins Tc pendant un certain temps, pendant l'application du deuxième champ magnétique, de sorte que l'alignement des grains magnétiques des zones de surface chauffées sélectivement soit modifié sélectivement ; arrêter l'application du deuxième champ magnétique une fois l'alignement sélectif assuré ; et refroidir les zones de surface chauffées, de sorte que leur température descende au dessous de Tc, le motif magnétique étant ainsi conservé dans la couche magnétique.
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Designated States: CN, DE, GB, JP, KR, SG, US
Publication Language: English (EN)
Filing Language: English (EN)