Abstract A magnetic bubble domain detector comprising two pairs of magnetoresistive elements connected to form a resistance bridge circuit. The pairs of elements are so arranged, electrically and geometrically that a magnetic bubble domain, in the detecting position, affects two elements simultaneously. The two elements are a pair and the elements are connected in electrical opposition but are positioned geometrically adjacent. This doubles the output from the bridge circuit when a bubble is at the detecting position. The arrangement of the elements of a pair also provides for the reduction of extraneous signals from domains in other positions, and for a reduction in the effect of the rotating field for propagating the domains.
Apparatus for detecting a magnetic bubble domain at a position in a propagating path, comprising: a resistance-bridge circuit at said position, the circuit comprising four magnetoresistive elements, the elements connected in two cooperating pairs, the elements of a pair connected in electrical opposition and positioned geometrically adjacent, said pairs positioned one on each side of said propagating path and also symmetrically about and one on each side of an axis extending parallel to and offset from said propagating path; means for connecting a constant current source across said circuit; and means for abstracting an output from said circuit.
Claim 2
Dependent Claim
98 words
Apparatus for detecting a magnetic bubble domain at a position in a propagating path, comprising: a resistance-bridge circuit at said position, the circuit comprising four magnetoresistive elements, the elements connected in two cooperating pairs, the elements of a pair connected in electrical opposition and positioned geometrically adjacent, said pairs positioned one on each side of said propagating path and also symmetrically about and one on each side of an axis extending parallel to and offset from said propagating path; means for connecting a constant current source across said circuit; and means for abstracting an output from said circuit.
Claim 3
Dependent Claim
50 words
Apparatus as claimed in claim 1, the elements inclined to the magnetic bubble domain propagation path and spaced symmetrically about the said path, the elements of each cooperating pair parallel to each other, the elements of one cooperating pair of opposite inclination to the elements of the other cooperating pair.
Claim 4
Dependent Claim
30 words
Apparatus as claimed in claim 1, the elements each of arcuate formation, the centre of the arc coincident with the axis of a magnetic bubble domain in the detecting position.
Claim 5
Dependent Claim
12 words
Apparatus as claimed in claim 1, the elements each of convolute form.