JPS57120254A - Magnetooptical recording carrier - Google Patents

Magnetooptical recording carrier

Info

Publication number
JPS57120254A
JPS57120254A JP423181A JP423181A JPS57120254A JP S57120254 A JPS57120254 A JP S57120254A JP 423181 A JP423181 A JP 423181A JP 423181 A JP423181 A JP 423181A JP S57120254 A JPS57120254 A JP S57120254A
Authority
JP
Japan
Prior art keywords
thin film
rotation
polarization
plane
garnet
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
JP423181A
Other languages
Japanese (ja)
Inventor
Masahiro Orukawa
Hideji Kawabata
Noriaki Hara
Akira Muto
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP423181A priority Critical patent/JPS57120254A/en
Publication of JPS57120254A publication Critical patent/JPS57120254A/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

Landscapes

  • Thin Magnetic Films (AREA)

Abstract

PURPOSE:To obtain an SN ratio enough for practical use by utilizing the Faraday rotation of a garnet thin film with large magnetic permeability and small coercive force, and the Kerr rotation of a magnetic thin film with large coercive force and the large amount of saturated magnetization in combination, and increasing a plane of polarization in turning angle. CONSTITUTION:A great portion of recording light passes through a garnet thin film 2 and is absorbed by an Mn-Cu-Bi alloy thin film 4 to write bits. The bits are transferred to the garnet thin film 2 as they are. Reproducing light passes through a substrate 1 and is transmitted through the garnet thin film 2. In this case, Faraday rotation permits its plane of polarization to rotate by about 0.3 deg.. Then, the light has Kerr rotation when reflected by the surface of the alloy thin film 4. At this time, the angle of Kerr rotation is increased under the influence of an SiO film 3 as an intermediate layer between the garnet thin film and alloy thin film 4 to obtain an about 1 deg. Kerror rotation angle. Thus, the reflected light having rotation of the plane of polarization further increases in angle of the polarization plane by 0.3 deg. when passing through the garnet thin film 2 again.
JP423181A 1981-01-14 1981-01-14 Magnetooptical recording carrier Pending JPS57120254A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP423181A JPS57120254A (en) 1981-01-14 1981-01-14 Magnetooptical recording carrier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP423181A JPS57120254A (en) 1981-01-14 1981-01-14 Magnetooptical recording carrier

Publications (1)

Publication Number Publication Date
JPS57120254A true JPS57120254A (en) 1982-07-27

Family

ID=11578789

Family Applications (1)

Application Number Title Priority Date Filing Date
JP423181A Pending JPS57120254A (en) 1981-01-14 1981-01-14 Magnetooptical recording carrier

Country Status (1)

Country Link
JP (1) JPS57120254A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57150158A (en) * 1981-03-13 1982-09-16 Ricoh Co Ltd Magnetooptic recording medium
JPS5841450A (en) * 1981-09-03 1983-03-10 Nec Corp Vertical magnetic recording medium
JPS58153244A (en) * 1982-03-05 1983-09-12 Matsushita Electric Ind Co Ltd Photomagnetic recording medium

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57150158A (en) * 1981-03-13 1982-09-16 Ricoh Co Ltd Magnetooptic recording medium
JPS5841450A (en) * 1981-09-03 1983-03-10 Nec Corp Vertical magnetic recording medium
JPS58153244A (en) * 1982-03-05 1983-09-12 Matsushita Electric Ind Co Ltd Photomagnetic recording medium

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