Discrimination of bubble state by bubble collapse

Details Discrimination of bubble state by bubble collapse Discrimination of bubble state by bubble collapse

1977-12-22

1979-04-10

MOffitt, James W.

Static information storage and retrieval

Magnetic bubbles

Detectors

365 30, 365 33, 365 36, G11C 1908

Patent

active

041492668

ABSTRACT:
A method for detecting the wall state of a soft bubble based upon the collapse characteristics of the bubble domain on a layer of bubble domain supporting material is described. The method includes the step of exchange coupling a magnetic layer, for example, an ion-implanted layer, to the bubble supporting layer. An in-plane field is applied to the bubble supporting layer when Bloch lines are present in the bubble domains. The bias field and the pulse field are set at a level to form a range of pulse widths which are suitable for the discrimination of soft bubble domains having different wall states. A pulse is then applied for a time sufficient to collapse only the S=1 bubble and not the S=0 bubble. Thereby this method distinguishes S=0 bubbles having one pair of winding Bloch lines from S=1 bubbles having one pair of unwinding Bloch lines. This method also distinguishes S=1 bubbles having a clockwise chirality from S=1 bubbles having a counterclockwise chirality.

REFERENCES:
patent: 3996577 (1976-12-01), Hsu
patent: 4068220 (1978-01-01), Argyle
IBM Technical Disclosure Bulletin-vol. 18, No. 4, Sep. 1975, pp. 1258-1261.

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