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    1.
    发明专利
    未知

    公开(公告)号：DE2310191A1

    公开(公告)日：1974-01-24

    申请号：DE2310191

    申请日：1973-03-01

    Applicant: IBM

    Inventor： HENDEL ROBERT JAMES ,  JAMBA JUN THEODORE FRANK ,  KEEFE GEORGE EDWARD ,  ROSIER LAURENCE LEE

    IPC: G11C11/14 ,  G11C19/08

    Abstract: A structure for increasing the reliability of a magnetic bubble domain memory system in which the operating margins of various components within the system are enlarged so that the margins of the components will have a larger area of overlap. For components in which a lessening of the effect of the bias field Hz is desirable (splitters, generators, corner propagation elements, etc.), a thin layer of magnetically soft material (for instance, permalloy) is provided which extends over the area of the magnetic sheet in which the component function takes place. This thin layer is in addition to the overlay elements used to provide the function. In a memory system, selectively placed "thin patches" of permalloy or strips of permalloy are used in the critical component areas to improve operating margins of these components.

    3.
    发明专利
    未知

    公开(公告)号：DE2542291A1

    公开(公告)日：1976-04-29

    申请号：DE2542291

    申请日：1975-09-23

    Applicant: IBM

    Inventor： HU HUNG LIANG ,  REYNOLDS JUN WILLIAM ALBERT ,  ROSIER LAURENCE LEE

    IPC: G11C11/14 ,  G11C19/08 ,  H01F10/00 ,  H01F41/14

    Abstract: A method of providing an initial lattice containing magnetic bubble domains in a film is disclosed. The method includes a first step of providing a confinement area in a film to contain magnetic domains, a second step of applying an AC in-plane magnetic field to form a plurality of rows of substantially perfect parallel stripe domains, and a third step of cutting the stripe domains into bubbles to form a substantially perfect lattice containing bubble domains.

    4.
    发明专利
    未知

    公开(公告)号：DE2460136A1

    公开(公告)日：1975-07-10

    申请号：DE2460136

    申请日：1974-12-19

    Applicant: IBM

    Inventor： ROSIER LAURENCE LEE

    IPC: G11C11/14 ,  G11C19/08

    Abstract: 1487861 Magnetic domain devices INTERNATIONAL BUSINESS MACHINES CORP 27 Dec 1974 [1 Feb 1974] 55911/74 Heading H3B Mutually repellant, variable size elements (especially magnetic bubbles) are propagated in a closed loop channel by selectively holding an element and changing the size of an element to cause interaction between the elements in the channel effective to propagate the elements when the held one is released. In Fig. 1 the channel is formed by ion-implanting, conductor patterns, grooves, or permalloy strip or discrete element overlays. A current pulse to conductor 26 expands bubbles labelled 1, 2, 3 to fill the space defined by the conductor and squash the others together. Bubble 33 is held outside the conductor by the current until it ceases whereupon the bubbles 31, 32, 33 enter the conductor loop as bubbles 1, 2, 3 contract. The current is at 100-500 kHz and may be accompanied by a bias field of 20 Oe possibly with a 60 Hz modulating field of 5 Oe. Bubbles may be nucleated within the channel by local laser heating or may be transferred laterally into it from Y and I-bar overlays or a conductor shift register by parallel conductors (A, B, C, Figs. 4, 6, 7, not shown), the shift register being operated by multiphase interlaced conductors (Fig. 8, not shown). Alternatively a lattice of bubbles may be formed by a large in-plane field and those in the channel contracted to a single strip whilst others are added by a conductor loop or by splitting; or an array of strip domains formed transverse to the conductor loop by an in plane field and the conductor pulsed to cause splitting.

    5.
    发明专利
    未知

    公开(公告)号：DE2327313A1

    公开(公告)日：1974-01-10

    申请号：DE2327313

    申请日：1973-05-29

    Applicant: IBM

    Inventor： CALHOUN BERTRAM ALLEN ,  CHANG HSU ,  ROSIER LAURENCE LEE ,  SLONCZEWSKI JOHN CASIMIR

    IPC: G11C11/14 ,  G11C19/08

    Abstract: 1437014 Moving domain systems INTERNATIONAL BUSINESS MACHINES CORP 15 June 1973 [22 June 1972] 28631/73 Heading H3B In a bubble domain system the fields applied to a bubble domain device are too small to cause propagation or collapse unless a controlling in-plane bias field is applied. In Fig. 4 strip lines X1, X2, Y1 and Y2 overlie bubble device 10 and may be activated in pairs to provide an in-plane bias field. The device 10 has an angel-fish propagation pattern 18, though any other propagation system may be used; the field source 12 provides a varying bias field normal to the device as is conventional when angel-fish are used, but this bias field variation is such that a domain oscillates between two adjacent angle-fish and does not propagate. It is found that when an in-plane field is applied by coincident operation of an X strip line and a Y strip line the domain mobility is increased and propagation occurs. The use of an in-plane control field also allows other functions such as annihilation to be similarly controlled; a presence/absence bubble domain system in which bubbles are only generated and collapsed, without being propagated, can also be controlled, Fig. 6 (not shown). The in-plane control may be used with any bubble domain material, the minimum in-plane field being when the field is perpendicular to the propagation direction and being given by the expression where h is the thickness of the material and A is its exchange coefficient.

    9.
    发明专利
    未知

    公开(公告)号：DE2227007A1

    公开(公告)日：1973-01-11

    申请号：DE2227007

    申请日：1972-06-02

    Applicant: IBM

    Inventor： CHANG HSU ,  KEEFE GEORGE EDWARD ,  LIN YEONG SHOW ,  ROSIER LAURENCE LEE

    IPC: G11C19/08 ,  H03M7/00 ,  G11C19/00

    Abstract: A decoder for cylindrical magnetic domain shift registers having means to clear the information from selected registers thus enabling new information to be written into those registers. The decoder is incorporated into 2N closed loop shift registers and uses only a small part of the storage area of the magnetic sheet in which domains exist. It is activated by 2N control lines (N pairs). Depending upon the activation of the decoder, the information in a selected shift register is passed to a clear means which sends it into one of two paths depending upon the activation of the clear means. One path brings the information to a detector for destructive readout, while the other path brings the information to a domain splitter. The domain splitter splits the input domains into two parts, one of which propagates to the detector while the other returns to the proper shift register. Thus, non-destructive readout (NDRO) or destructive read-out (DRO) is provided depending upon the activation of the clear means.

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