JPS644941A - Production of magneto-optical disk - Google Patents

Production of magneto-optical disk

Info

Publication number
JPS644941A
JPS644941A JP16025387A JP16025387A JPS644941A JP S644941 A JPS644941 A JP S644941A JP 16025387 A JP16025387 A JP 16025387A JP 16025387 A JP16025387 A JP 16025387A JP S644941 A JPS644941 A JP S644941A
Authority
JP
Japan
Prior art keywords
substrate
crystallized regions
layer
forming
guide grooves
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP16025387A
Other languages
Japanese (ja)
Inventor
Keiji Shono
Hiroshi Kano
Masahiro Nakada
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP16025387A priority Critical patent/JPS644941A/en
Publication of JPS644941A publication Critical patent/JPS644941A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/10582—Record carriers characterised by the selection of the material or by the structure or form
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/10582—Record carriers characterised by the selection of the material or by the structure or form
    • G11B11/10584—Record carriers characterised by the selection of the material or by the structure or form characterised by the form, e.g. comprising mechanical protection elements

Abstract

PURPOSE:To reduce the cost of a stage for forming guide grooves by forming an amorphous substd. magnetic garnet layer on a substrate, scanning prescribed laser light thereto to crystallize the layer and forming the guide groove by utilizing the difference in etching rate between crystallized regions and non- crystallized regions. CONSTITUTION:The amorphous bismuth substd. magnetic garnet layer 2 is formed by a sputtering method on the GGG substrate 1 having a disk shape and the laser light 3 condensed to the width of the guide groove 5 is concentrically or spirally scanned on this substrate 1 to crystallize said layer. Steps are made by utilizing the difference in the etching rate between the crystallized regions and the non-crystallized regions and the disk substrate 1 is formed with such steps as the guide grooves 5. Since the formation of the guide grooves 5 is executed not on the surface of the substrate 1 but on the surface of the recording medium in such a manner, the formation is simpler than heretofore. The production cost is thereby reduced.
JP16025387A 1987-06-26 1987-06-26 Production of magneto-optical disk Pending JPS644941A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16025387A JPS644941A (en) 1987-06-26 1987-06-26 Production of magneto-optical disk

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16025387A JPS644941A (en) 1987-06-26 1987-06-26 Production of magneto-optical disk

Publications (1)

Publication Number Publication Date
JPS644941A true JPS644941A (en) 1989-01-10

Family

ID=15711006

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16025387A Pending JPS644941A (en) 1987-06-26 1987-06-26 Production of magneto-optical disk

Country Status (1)

Country Link
JP (1) JPS644941A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8512916B2 (en) 2008-03-31 2013-08-20 Hoya Corporation Photomask blank, photomask, and method for manufacturing photomask blank

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8512916B2 (en) 2008-03-31 2013-08-20 Hoya Corporation Photomask blank, photomask, and method for manufacturing photomask blank
JP5579056B2 (en) * 2008-03-31 2014-08-27 Ｈｏｙａ株式会社 Photomask blank, photomask and photomask blank manufacturing method
US9075314B2 (en) 2008-03-31 2015-07-07 Hoya Corporation Photomask blank, photomask, and method for manufacturing photomask blank

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