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    2.
    发明专利
    未知

    公开(公告)号：DE2801052A1

    公开(公告)日：1978-07-13

    申请号：DE2801052

    申请日：1978-01-11

    Applicant: IBM

    Inventor： ARGYLE BERNELL EDWIN ,  DEKKER PIETER ,  SLONCZEWSKI JOHN CASIMIR

    IPC: G11C11/14 ,  G11C19/08 ,  H01F10/00

    Abstract: Magnetic bubble domains are propagated in a magnetic medium in a desired direction using in-plane magnetic fields which are time varying but which have no spatial gradients. In applications such as information storage, the need for conventional propagation structures, such as offset conductor loops, patterned magnetic elements, and patterned ion implantation regions is reduced. Bubble domains having unwinding pairs of Bloch lines in their wall magnetization can be moved by applying appropriate in-plane magnetic fields, without the need for spatial gradients or variations in the magnetic field normal to the plane of the magnetic medium. The continuous movement of these bubble domains occurs by a cyclic process where the Bloch lines switch between two configurations, in an asymmetric way in response to the time varying in-plane field.

    4.
    发明专利
    未知

    公开(公告)号：DE2725391A1

    公开(公告)日：1977-12-29

    申请号：DE2725391

    申请日：1977-06-04

    Applicant: IBM

    Inventor： ARGYLE BERNELL EDWIN ,  DEKKER PIETER ,  SLONCZEWSKI JOHN CASIMIR

    IPC: G11C11/14 ,  G11C19/08 ,  H01F10/00

    Abstract: A technique for controllably providing state conversions between bubble domains having a common winding number S is described. In particular, controlled conversions between bubble domains having winding number S=1 is achieved by the application of spatially invariant, homogeneous magnetic fields. For the conversion of sigma bubbles (having two vertical Bloch lines) to chi bubbles (having no vertical Bloch lines), an in-plane field is not required and only a time varying perpendicular z-field is used. For conversion of a chi + bubble to a chi - bubble, and vice versa, a time varying field pulse is applied, there being no requirement for an in-plane magnetic field. However, for the conversion of chi bubbles to sigma bubbles, an in-plane field is used simultaneously with a time varying z-field. For all controlled conversions, the applied magnetic fields do not have spatial gradients. The magnitudes of the applied magnetic fields and the rise and fall times of the z field are controlled within certain ranges in order to have controlled conversion of one state to another.

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