MAGNETORESISTIVE GRADIOMETER HEAD Russian patent published in 2014 - IPC H01L43/08 B82Y40/00 

FIELD: physics.

SUBSTANCE: invention relates to magnetic nanoelements. Magnetoresistive gradiometer head has a substrate with a dielectric layer on which there are four rows of thin-film magnetoresistive strips connected in series by low-resistance jumpers in each arm of a bridge circuit, said rows being connected into a bridge circuit by said jumpers, each of said strips having top and bottom protective layers with a ferromagnetic film in between, a first insulating layer on top of the thin-film magnetoresistive strips, on which is formed a first planar conductor with working parts, arranged over the thin-film magnetoresistive strips and a second insulating layer, a second planar conductor passing over and along the working thin-film magnetoresistive strip and a protective layer, wherein all thin-film magnetoresistive strips lie in one row, in all thin-film magnetoresistive strips the easy magnetisation axis of the ferromagnetic film is directed at an angle of 45° relative the longitudinal axis of the thin-film magnetoresistive strip, and the working arm of the bridge circuit closest to the edge of the gradiometre head is far from the three ballast arms of the bridge circuit, the width of the ballast thin-film magnetoresistive strip is N times smaller than the width of the working thin-film magnetoresistive strip, and the ballast row of the bridge circuit consists of a set of N parallel-connected thin-film magnetoresistive strips.

EFFECT: invention weakens the local magnetic field acting on a magnetoresistive gradiometer head and increases sensitivity.

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