Thomson-csf

Fr&eacute;d&eacute;ric Nguyen Van Dau

Alain Schuhl

Armando Encinas

Fran&ccedil;ois Montaigne

A magnetic detector which includes a first thin-layer element and a second thin-layer element made of magnetic material with magnetic anisotropy in the plane possessing, in this plane, two easy axes of magnetization. A coercive field of one of the first and second thin-layer elements has a value different from that of the other thin-layer element. The two thin-layer elements have elongated and mutually parallel shapes perpendicular to their direction of easy magnetization in the absence of a magnetic field. The width of these thin-layer elements is such that it obliges at least one of the thin-layer elements to have its magnetization oriented along the length of the thin-layer element when there is no external magnetic field. Such a magnetic field sensor may find particular application to the measurement of magnetic fields.

Magnetic field sensor using magneto-resistance of ferromagnetic layers with parallel magnetic axes

A magnetic field sensor which includes a planar thin-film element made of a crystalline magnetoresistive material exhibiting resistivity anisotropy in a plane, having a first and a second easy axis of magnetization. The planar thin-film element has electrical connections allowing a first electrical measurement current to flow through the planar thin-film element in a first direction, as well as two other electrical connections allowing a voltage to be measured in a second direction transverse to the first direction. The two easy axes of magnetization have comparable magnetization values. The sensor includes an electrical conductor placed parallel to the first easy axis of magnetization, insulated from the magnetoresistive material, and allowing an electrical control current to flow, in which the control current induces, in the planar thin-film element, a magnetic field which imposes, when the sensor is not in use, an orientation of the direction of magnetization of the element parallel to the second easy axis of magnetization.

Growing community of inventors

Palaiseau, France

Frédéric Nguyen Van Dau

Growing community of inventors

Palaiseau, France

Fr&eacute;d&eacute;ric Nguyen Van Dau

Frédéric Nguyen Van Dau