JPS57183646A - Magnetic recorder and reproducer - Google Patents

Magnetic recorder and reproducer

Info

Publication number
JPS57183646A
JPS57183646A JP6858981A JP6858981A JPS57183646A JP S57183646 A JPS57183646 A JP S57183646A JP 6858981 A JP6858981 A JP 6858981A JP 6858981 A JP6858981 A JP 6858981A JP S57183646 A JPS57183646 A JP S57183646A
Authority
JP
Japan
Prior art keywords
film
magnetic
magnetization
magnetic thin
vertical
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
JP6858981A
Other languages
Japanese (ja)
Inventor
Yoshikazu Ichiyama
Hiroki Murayama
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP6858981A priority Critical patent/JPS57183646A/en
Publication of JPS57183646A publication Critical patent/JPS57183646A/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
    • G11B11/10532—Heads
    • G11B11/10541—Heads for reproducing
    • G11B11/10543—Heads for reproducing using optical beam of radiation
    • G11B11/10547—Heads for reproducing using optical beam of radiation interacting with the magnetisation of an intermediate transfer element, e.g. magnetic film, included in the head

Abstract

PURPOSE:To improve the S/N of a reproduced signal at a high density recording region, by detecting the state of magnetization by means of a magnetrooptical effect for a magnetic thin film that is set close and vertically to a magnetic recording medium between two magnetic thin films of high permeability that hold the magnetic thin film of a magnetic head between them. CONSTITUTION:Magnetic thin films 21 and 22 of high permeability are arranged to hold a magnetic thin film 23 containing a magnetization-facilitating axis in the direction vertical to the film surface, A magnetic head is formed with these two films 21 and 22, and this magnetic head is set close and vertically to a vertical magnetized film 11. A light beam 30 given from a laser source 24 passes through a polarizer 25 and is made incident to the film 23 through a lens 25 and via the hole of the film 22. The polarized surface of the reflected beam turns according to the direction of magnetization of the film 23, and the light beam is made incident to a photodetector 29 via the lens 25, a half mirror 26 and a beam detector 28 to be reproduced. The image resolution is decided by using the thickness of a main magnetic pole instead of the size of the beam spot. As a result, the S/N of a reproduced signal is improved at a high density recording region for vertical magnetization recording.
JP6858981A 1981-05-07 1981-05-07 Magnetic recorder and reproducer Pending JPS57183646A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6858981A JPS57183646A (en) 1981-05-07 1981-05-07 Magnetic recorder and reproducer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6858981A JPS57183646A (en) 1981-05-07 1981-05-07 Magnetic recorder and reproducer

Publications (1)

Publication Number Publication Date
JPS57183646A true JPS57183646A (en) 1982-11-12

Family

ID=13378126

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6858981A Pending JPS57183646A (en) 1981-05-07 1981-05-07 Magnetic recorder and reproducer

Country Status (1)

Country Link
JP (1) JPS57183646A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8302585A (en) * 1982-07-19 1984-02-16 Nippon Telegraph & Telephone MAGNETIC HEAD.
NL8403951A (en) * 1983-12-29 1985-07-16 Fuji Photo Film Co Ltd METHOD AND APPARATUS FOR REPRODUCING MAGNETIC INFORMATION.
JPS6139956A (en) * 1984-07-31 1986-02-26 Nippon Hoso Kyokai <Nhk> Magnetooptic head
EP0195628A2 (en) * 1985-03-20 1986-09-24 Hitachi, Ltd. Magnetic head
JPS61214263A (en) * 1985-03-20 1986-09-24 Hitachi Ltd Optical reproducing magnetic head
JPS62185267A (en) * 1986-02-12 1987-08-13 Hitachi Ltd Photomagnetic type reproducing magnetic head
US5296989A (en) * 1990-08-24 1994-03-22 Sony Corporation High density dual gap magnetic head using polar Kerr effect

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8302585A (en) * 1982-07-19 1984-02-16 Nippon Telegraph & Telephone MAGNETIC HEAD.
NL8403951A (en) * 1983-12-29 1985-07-16 Fuji Photo Film Co Ltd METHOD AND APPARATUS FOR REPRODUCING MAGNETIC INFORMATION.
JPS6139956A (en) * 1984-07-31 1986-02-26 Nippon Hoso Kyokai <Nhk> Magnetooptic head
EP0195628A2 (en) * 1985-03-20 1986-09-24 Hitachi, Ltd. Magnetic head
JPS61214263A (en) * 1985-03-20 1986-09-24 Hitachi Ltd Optical reproducing magnetic head
JPS62185267A (en) * 1986-02-12 1987-08-13 Hitachi Ltd Photomagnetic type reproducing magnetic head
US5296989A (en) * 1990-08-24 1994-03-22 Sony Corporation High density dual gap magnetic head using polar Kerr effect
EP0472188B1 (en) * 1990-08-24 1996-10-16 Sony Corporation Magnetic head

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