JPS5727450A - Magnetic recording medium - Google Patents

Magnetic recording medium

Info

Publication number
JPS5727450A
JPS5727450A JP10090880A JP10090880A JPS5727450A JP S5727450 A JPS5727450 A JP S5727450A JP 10090880 A JP10090880 A JP 10090880A JP 10090880 A JP10090880 A JP 10090880A JP S5727450 A JPS5727450 A JP S5727450A
Authority
JP
Japan
Prior art keywords
layer
coercive force
mirror
polarized
laser beam
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
JP10090880A
Other languages
Japanese (ja)
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 JP10090880A priority Critical patent/JPS5727450A/en
Publication of JPS5727450A publication Critical patent/JPS5727450A/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

Abstract

PURPOSE:To realize the reading of signals, by carrying out the optical recording to a vertical magnetic layer having a high coercive force and detecting the polarized angle reflected from a vertical magnetic layer having a large magneto-optical effect and a low coercive force. CONSTITUTION:The information is written in a writing layer 13 having a low Curie point and a high coercive force by the laser beam given from a light source 15 and via a half mirror 16 and a condenser lens 17. On the other hand, the laser beam is irradiated to the layer 13 through a magnetic field coil 18, and only the area having a temperature higher than the Curie point is vertically magnetized. The information recorded to the layer 13 is polarized by a polarizer 19 given from the source 15 which is less intensive than that during the recording and then made incident to a reading layer 11 having a large magneto-optical effect and a low coercive force via the mirror 16 and the lens 17. This polarized light has the rotations due to the Faraday effect and is reflected by a reflecting film 12 to receive a photoelectric conversion through the mirror 16 and a photodetector 20.
JP10090880A 1980-07-23 1980-07-23 Magnetic recording medium Pending JPS5727450A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10090880A JPS5727450A (en) 1980-07-23 1980-07-23 Magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10090880A JPS5727450A (en) 1980-07-23 1980-07-23 Magnetic recording medium

Publications (1)

Publication Number Publication Date
JPS5727450A true JPS5727450A (en) 1982-02-13

Family

ID=14286432

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10090880A Pending JPS5727450A (en) 1980-07-23 1980-07-23 Magnetic recording medium

Country Status (1)

Country Link
JP (1) JPS5727450A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5930255A (en) * 1982-08-11 1984-02-17 Nippon Hoso Kyokai <Nhk> Magnetooptic head
JPS6083305A (en) * 1983-10-14 1985-05-11 Hitachi Ltd Magneto-optic medium
JPS6098539A (en) * 1983-11-04 1985-06-01 Daido Steel Co Ltd Magnetic thin film recording medium

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5930255A (en) * 1982-08-11 1984-02-17 Nippon Hoso Kyokai <Nhk> Magnetooptic head
JPH0355894B2 (en) * 1982-08-11 1991-08-26
JPS6083305A (en) * 1983-10-14 1985-05-11 Hitachi Ltd Magneto-optic medium
JPS6098539A (en) * 1983-11-04 1985-06-01 Daido Steel Co Ltd Magnetic thin film recording medium
JPH053665B2 (en) * 1983-11-04 1993-01-18 Daido Tokushuko Kk

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