Method for obtaining circumferential orientation of magnetic films electroplated on wires
    6.
    发明授权
    Method for obtaining circumferential orientation of magnetic films electroplated on wires 失效
    用于获取电线电磁膜的圆周方向的方法

    公开(公告)号:US3556954A

    公开(公告)日:1971-01-19

    申请号:US3556954D

    申请日:1968-07-29

    Applicant: GEN ELECTRIC

    Inventor: LUBORSKY FRED E

    CPC classification number: H01F10/00 C25D5/006 C25D5/12 C25D7/0607

    Abstract: A CIRCUMFERNTIAL MAGNETIC ORIENTATION IS OBTAINED IN A NICKEL-IRON MAGNETIC FILM DEPOSITED UPON A TUNGSTEN WIRE CORE SUCCESSIVELY PLATED WITH GOLD, COPPER AND GOLD LAYERS BY REVOLVING A LINEAR MAGNETIC FIELD GREATER THAN 15 OERSTEDS ABOUT THE WIRE SUBSTRATE DURING THE PLATING OF THE NICKEL-IRON FILM. THE FIELD IS ROTATED AT A SPEED GREATER THAN ABOUT ONE REVOLUTION PER 10 A. LAYER OF MAGNETIC FILM DEPOSITED AND, AFTER DEPOSITION OF THE MAGNETIC FILM TO A THICKNESS LESS THAN 15,000 A., THE MAGNETIC FILM PLATED WIRE IS ANNEALED AT A TEMPERATURE BELOW 400*C. TO DECREASE THE DISPERSION OF ANISOTROPY OF THE FILM IN THE CIRCUMFERENTIAL DIRECTION.

    Electron beam readout of magnetic storage disc
    10.
    发明授权
    Electron beam readout of magnetic storage disc 失效
    电子束读取磁存储盘

    公开(公告)号:US3573767A

    公开(公告)日:1971-04-06

    申请号:US3573767D

    申请日:1968-11-27

    Applicant: GEN ELECTRIC

    CPC classification number: G11B5/4886 G11B11/10 G11C13/06

    Abstract: A rotating disc coated with a thin magnetic film is used in a vacuum system as a high density data storage medium. A group of magnetic recording heads, overlapped in stairstep fashion, are actuator-positioned so that one complete band of tracks may be recorded in a single revolution of the disc. Interrogation is accomplished by controllably deflecting an electron beam in a radial direction toward any predetermined track. The electron beam is reflected by an electric potential on the disc surface and deflected by the magnetic field just above the surface. Differential sensing of reflected current allows determination of the stored information.

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