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    2.
    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.

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