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    Magnetooptical recording medium and methods
    4.
    发明专利
    Magnetooptical recording medium and methods 未知

    公开(公告)号：AU659976B2

    公开(公告)日：1995-06-01

    申请号：AU6877294

    申请日：1994-07-28

    Applicant: CANON KK

    Inventor： OSATO YOICHI ,  MIYATA KATZUMI

    IPC: G11B11/105 ,  G11B11/12 ,  G11B13/04

    Abstract: A magnetooptical recording medium is constituted by laminating at least a first magnetic layer and a second magnetic layer in an order named on a substrate which has transparency and on which receiving a laser beam is incident. The coercive force of the second magnetic layer is greater than that of the first magnetic layer. The coercive force of the second magnetic layer is greater than sigma w/2Ms2h2, where sigma w is a magnetic wall energy between the first and second magnetic layers, Ms2 is a saturation magnetization of the second magnetic layer, and h2 is a film thickness of the second magnetic layer. The coercive force of the first magnetic layer is grater than sigma w/2Ms1h1, where Ms1 is a saturation magnetization of the first magnetic layer, and h1 is a film thickness of the first magnetic layer. The compensation temperature of the first magnetic layer is smaller than the Curie temperature of the first magnetic layer. A method of recording information on the magnetooptical recording medium is effected as follows. A direction of a magnetic moment of the first magnetic layer is aligned in one direction by applying an external magnetic field thereto. A laser spot with low power is irradiated to the medium while applying a recording bias magnetic field in the same direction as the direction of the external magnetic field so as to form a first recording bit in a high temperature region in the laser spot. A laser spot with high power is irradiated to the medium while applying the recording bias magnetic field so as to form a second recording bit in which a magnetic wall is present between the first and second magnetic layers, in the high-temperature region in the laser spot. One of the first bit forming recording and the second bit forming recording is selectively determined in correspondence with information.

    7.
    发明专利
    未知

    公开(公告)号：FR2627003A1

    公开(公告)日：1989-08-11

    申请号：FR8901428

    申请日：1989-02-03

    Applicant: CANON KK

    Inventor： OSATO YOICHI

    IPC: G11C19/08

    Abstract: Disclosed is an improved magnetic bubble recording device for optically effecting writing, reading and erasure of information with respect to magnetic bubbles. The magnetic bubble recording device has a basic structure in which a first magnetic film for forming a magnetic bubble therein and a second magnetic film for imparting a bias magnetic field to the first magnetic film to stably hold the maganetic bubble in the first magnetic film are provided on a substrate on which is formed a transfer pattern for transferring a magnetic bubble along the transfer pattern, thereby providing a portable magnetic bubble recording device at low cost and with a simple structure. In addition, an alignment pattern for aligning the device with a light beam applied to the device is formed on the device, thereby permitting accurate writing and reading. The peripheral edge portion of the pattern of a transfer channel has a surface inclined with respect to the substrate surface so as to transfer the magnetic bubble favorably. Further, a device is provided in which a first transfer channel includes a plurality of transfer channels that do not intersect each other and a second transfer channel that intersects the transfer channels constituting the first transfer channel, formed so as to effect optical reading and writing smoothly and at high speed.

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