Thin film magnetic bubble detector
AssigneeIntel Magnetics, Inc.
InventorPeter J. Silverman
Life of this patent
Estimating the term…
Abstract
A magnetic bubble detector which includes chevron propagation elements and underlying thin film magnetoresistive members is described. A portion of the dummy detection member is misaligned from its overlying chevrons. This misalignment provides a bias to the detection circuitry. A negative voltage is detectable when no bubble is present and a positive potential when a bubble is present. This allows easy matching between the detector and sense amplifier.
Claims12
In a magnetic bubble detector which includes a first propagation element for propagating magnetic bubbles and an active detection member insulated from said first element and aligned with respect to said first element so as to detect magnetic bubbles propagated by said first element, and a second propagation element and a dummy detection member insulated from said second element for providing a signal to compensate for the effects of a rotating, in-plane magnetic field on said active detection member, an improvement wherein:
- a first portion of said dummy detection member is aligned with respect to said second element in the same manner as said alignment between said first element and said active detection member, and a second portion of said dummy detection member is differently aligned with respect to said second element;
- whereby the signal resulting from said dummy member may be used to provide more reliable detection of bubbles propagated by said first element.
A magnetic bubble detector comprising:
- a first propagation element for receiving expanded magnetic bubbles;
- an active detection member insulated from said first element and aligned with respect to said first element so as to detect magnetic bubbles propagated by said first element;
- a second propagation element;
- a dummy detection member insulated from said second propagation element, said dummy member including a first portion which is aligned with respect to said second element in the same manner as said alignment between said first element and said active member and a second portion differently aligned with respect to said second element;
- whereby the signal from said dummy member can be used for more reliable detection of bubbles propagated by said first element.
A magnetic bubble detector comprising:
- an expander for expanding magnetic bubbles;
- a first line of chevrons for receiving expanded bubbles from said expander;
- an active detection member comprising a strip of magnetoresistive material disposed beneath and insulated from said first line of chevrons, said active member having a predetermined alignment with respect to said first line of chevrons;
- a second line of chevrons;
- a magnetic bubble trap disposed between said first line of chevrons and said second line of chevrons to prevent magnetic bubbles from propagating to said second line of chevrons;
- a dummy detection member disposed beneath and insulated from said second line of chevrons, said dummy detection member including a first portion having a first alignment with respect to said second line of chevrons and a second portion having a second alignment with respect to said second line of chevrons, said first and second alignments being different from one another;
- whereby the signal from said dummy member can be used to provide more reliable detection of bubbles propagated by said first element.
Dependencies are inferred from the claim text.