JPS57164418A - Vertical heat magnetic recording medium - Google Patents

Vertical heat magnetic recording medium

Info

Publication number
JPS57164418A
JPS57164418A JP4964581A JP4964581A JPS57164418A JP S57164418 A JPS57164418 A JP S57164418A JP 4964581 A JP4964581 A JP 4964581A JP 4964581 A JP4964581 A JP 4964581A JP S57164418 A JPS57164418 A JP S57164418A
Authority
JP
Japan
Prior art keywords
magnetic
recording medium
heat
vertical
layer
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.)
Granted
Application number
JP4964581A
Other languages
Japanese (ja)
Other versions
JPH0341906B2 (en
Inventor
Motoharu Tanaka
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.)
Ricoh Co Ltd
Original Assignee
Ricoh Co 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP4964581A priority Critical patent/JPS57164418A/en
Publication of JPS57164418A publication Critical patent/JPS57164418A/en
Publication of JPH0341906B2 publication Critical patent/JPH0341906B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
    • G03G5/16—Layers for recording by changing the magnetic properties, e.g. for Curie-point-writing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G11B5/1278—Structure or manufacture of heads, e.g. inductive specially adapted for magnetisations perpendicular to the surface of the record carrier
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B2005/0002—Special dispositions or recording techniques
    • G11B2005/0005—Arrangements, methods or circuits
    • G11B2005/0021—Thermally assisted recording using an auxiliary energy source for heating the recording layer locally to assist the magnetization reversal
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B2005/0002—Special dispositions or recording techniques
    • G11B2005/0026—Pulse recording
    • G11B2005/0029—Pulse recording using magnetisation components of the recording layer disposed mainly perpendicularly to the record carrier surface
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
    • G11B5/09—Digital recording

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Recording Or Reproducing By Magnetic Means (AREA)
  • Magnetic Record Carriers (AREA)

Abstract

PURPOSE:To obtain a vertical head magnetic recording medium having no contact nor overlapping between magnetic patterns, by providing a magnetic layer whose magnetic permeability is high, on the substrate, and providing a magnetic recording layer having high coercive force and vertical magnetic anisotropy, on said magnetic layer. CONSTITUTION:A vertical heat (light) magnetic recording medium 13' consits of a substrate 13A, a magnetic layer 13B whose magnetic permeability is high, and a magnetic recording layer 13C having high coercive force and vertical magnetic anisotropy. A heat (light) beam from a heat (light) beam source 11 is focused on a recording medium 13, moving the recording medium 13 in the direction as indicated with an arrow. A part shown by a circle (a) irradiated by the hot beam reaches a curie point or above, is magnetized in the magnetic field direction from a coil 14, and while a heated part is moved by DELTAx and reaches a position of a circle (b), a shaded portion (c) drops quickly in temperature, and the magnetizing direction of its partis fixed so as not to follow the magnetic field. Accordingly, since it is possible to obtain a crescent-shaped and smooth pattern much smaller than a heat beam spot, there is no contact nor overlapping between magnetic patterns.
JP4964581A 1981-04-02 1981-04-02 Vertical heat magnetic recording medium Granted JPS57164418A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4964581A JPS57164418A (en) 1981-04-02 1981-04-02 Vertical heat magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4964581A JPS57164418A (en) 1981-04-02 1981-04-02 Vertical heat magnetic recording medium

Publications (2)

Publication Number Publication Date
JPS57164418A true JPS57164418A (en) 1982-10-09
JPH0341906B2 JPH0341906B2 (en) 1991-06-25

Family

ID=12836938

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4964581A Granted JPS57164418A (en) 1981-04-02 1981-04-02 Vertical heat magnetic recording medium

Country Status (1)

Country Link
JP (1) JPS57164418A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60212850A (en) * 1984-04-09 1985-10-25 Matsushita Electric Ind Co Ltd Photomagnetic disk
JPS61145337U (en) * 1985-02-28 1986-09-08
JPS61163338U (en) * 1985-03-26 1986-10-09
WO1991011807A1 (en) * 1990-01-31 1991-08-08 Sony Corporation Optical disc system and optical disc
JPH0453046A (en) * 1990-06-20 1992-02-20 Sharp Corp Magneto-optical recording medium
US5392263A (en) * 1990-01-31 1995-02-21 Sony Corporation Magneto-optical disk system with specified thickness for protective layer on the disk relative to the numerical aperture of the objective lens
US5618638A (en) * 1990-01-29 1997-04-08 Brother Kogyo Kabushiki Kaisha Optical magnetic recording medium
US5910932A (en) * 1991-09-11 1999-06-08 Sony Corporation Optical disk and optical disk system with numerical aperture of objective lens related to protective layer thickness of optical disk

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5589928A (en) * 1978-12-27 1980-07-08 Fujitsu Ltd Vertical magnetic recorder and its reproduction system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5589928A (en) * 1978-12-27 1980-07-08 Fujitsu Ltd Vertical magnetic recorder and its reproduction system

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60212850A (en) * 1984-04-09 1985-10-25 Matsushita Electric Ind Co Ltd Photomagnetic disk
JPS61145337U (en) * 1985-02-28 1986-09-08
JPS61163338U (en) * 1985-03-26 1986-10-09
US5618638A (en) * 1990-01-29 1997-04-08 Brother Kogyo Kabushiki Kaisha Optical magnetic recording medium
WO1991011807A1 (en) * 1990-01-31 1991-08-08 Sony Corporation Optical disc system and optical disc
US5392263A (en) * 1990-01-31 1995-02-21 Sony Corporation Magneto-optical disk system with specified thickness for protective layer on the disk relative to the numerical aperture of the objective lens
USRE37428E1 (en) 1990-01-31 2001-10-30 Sony Corporation Magneto-optical disk system with specified thickness for protective layer on the disk relative to the numerical aperture of the objective lens
JPH0453046A (en) * 1990-06-20 1992-02-20 Sharp Corp Magneto-optical recording medium
US5910932A (en) * 1991-09-11 1999-06-08 Sony Corporation Optical disk and optical disk system with numerical aperture of objective lens related to protective layer thickness of optical disk

Also Published As

Publication number Publication date
JPH0341906B2 (en) 1991-06-25

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