MAGNETORESISTIVE GRADIOMETER HEAD Russian patent published in 2014 - IPC H01L43/08 B82B1/00 

FIELD: physics.

SUBSTANCE: 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 nonmagnetic 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, where in all thin-film magnetoresistive strips, the easy magnetisation axis of the ferromagnetic film is directed at an angle of 45° relative to the longitudinal axis of the thin-film magnetoresistive strip, a first insulating layer on top of the thin-film magnetoresistive strips on which is formed a conductor with two contacts with working parts lying over the thin-film magnetoresistive strips with working parts of the conductor, lying over the thin-film magnetoresistive strips, a second insulating layer and a protective layer, wherein all thin-film magnetoresistive strips are arranged in one row, and the row of thin-film magnetoresistive strips closest to the edge of the substrate lies at a distance from the other three rows of thin-film magnetoresistive strips of not less than a tenth of repetition periods of said rows, the second insulating layer is provided with a calibration conductor placed over the working thin-film magnetoresistive strips of the bridge circuit.

EFFECT: design of a magnetoresistive gradiometer head with a planar calibration conductor which enables to determine operating capacity of the head without using an external source of a local magnetic field.

3 dwg