Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Allegro Microsystems, LLC

Commissariat a L'energie Atomique

Other

Peugeot Citroen Automobiles Sa

Axalto S.a.

Elekta Neuromag Oy

Claude Fermon

Myriam Pannetier-Lecoeur

Alexander Latham

Bryan Cadugan

Paolo Campiglio

Myriam Pannetier

Rémy Lassalle-Balier

Gerardo A Monreal

Aurélie Solignac

Hernán D Romero

Alejandro Gabriel Milesi

Marie-Claire Cyrille

Jason Boudreau

Cyril Dressler

Béatrice Bonvalot

Vincent Trauchessec

Nicolas Biziere

Hedwige Polovy

Michael C Doogue

Andreas P Friedrich

Shaun D Milano

Juha T Simola

Francis Roy

Damien Dehu

Wade Bussing

Noémie Belin

Amal Hamdache

Alain Giraud

Pierre-André Guitard

Thierry Sollier

Francois Vacher

Jacques Jacquinot

Joseph Scola

Kamil Akmaldinov

Mathieu Bailleul

Manon Giraud

Florian Pallier

Guenaelle Jasmin

Francois-Damien Delapierre

Guénaëlle Jasmin-Lebras

Xavier Du Hamel De Milly

Juha Simola

François Vacher

A magnetoresistive stack includes a reference layer including a magnetic layer, an antiferromagnetic layer in exchange coupling with the magnetic layer, a magnetic layer substantially of the same magnetisation as the magnetic layer, a spacer layer between the magnetic layers with a thickness for enabling an antiferromagnetic coupling between the magnetic layers of a first coupling intensity, a free layer having a coercivity of less than 10 microTesla, the free layer including a magnetic layer, an antiferromagnetic layer in exchange coupling with the magnetic layer, a magnetic layer substantially of the same magnetisation as the magnetic layer, a spacer layer between the magnetic layers with a thickness for enabling an antiferromagnetic coupling between the magnetic layers of a second coupling intensity lower than the first coupling intensity, a third spacer layer separating the reference and free layers.

Magnetoresistive stack without radiated field, sensor and magnetic mapping system comprising such a stack

A device for magnetically detecting microscopic biological objects includes a microfluidic channel having a fluid inlet and a fluid outlet; a plurality of magnetic sensors arranged against an inner wall of the microfluidic channel; and a permanent magnet arranged against an outer wall of the microfluidic channel, in such a way that the plurality of magnetic sensors is immersed in a magnetic field created by the permanent magnet; the plurality of magnetic sensors including a first magnetic sensor; a second magnetic sensor opposite the first magnetic sensor; a third magnetic sensor downstream of the first and second magnetic sensors.

Device and method for magnetically detecting microscopic biological objects

A magnetic field sensor includes at least one coil responsive to an AC coil drive signal; at least one magnetic field sensing element responsive to a sensing element drive signal and configured to detect a directly coupled magnetic field generated by the at least one coil and to generate a magnetic field signal in response to the directly coupled magnetic field; a processor responsive to the magnetic field signal to compute a sensitivity value associated with detection of the directly coupled magnetic field and substantially independent of a reflected magnetic field reflected by a conductive target disposed proximate to the at least one magnetic field sensing element; and an output signal generator configured to generate an output signal of the magnetic field sensor indicative of the reflected magnetic field.

Coil actuated sensor with sensitivity detection

Apparatus includes a first portion of conductive material having varying response to a generated magnetic field along a length of the conductive material, wherein the first portion of conductive material produces a varying eddy current and a varying reflected magnetic field, in response to the generated magnetic field. The apparatus further includes one or more reference portions of conductive material having a relatively invariable response to the generated magnetic field, wherein the reference portion of conductive material produces a relatively invariable eddy current and a relatively invariable reflected magnetic field in response to the generated magnetic field.

Targets for coil actuated position sensors

A system for suppressing low frequency noise of magnetoresistive sensors, includes a device for measuring a magnetic field, the device including at least one magnetoresistive sensor, the magnetoresistive sensor having a first sensitivity at a first operating point and a second sensitivity at a second operating point, the sensitivity at the second operating point being low or zero; a modulator configured to switch the at least one magnetoresistive sensor from the first operating point to the second operating point; and a signal processor for processing the signal derived from the device for measuring a magnetic field.

System and method for suppressing low frequency noise of magnetoresistive sensors

System and method for suppressing low frequency noise of magnetoresistive sensors with tunnel magnetoresistance

In one aspect, a magnetic field angle sensor includes a bridge structure that include a sine bridge configured to generate a sinusoidal signal indicative of a magnetic field along a first axis and a cosine bridge configured to generate a cosinusoidal signal indicative of the magnetic field along a second axis that is orthogonal with respect to the first axis. One of the sine bridge or the cosine bridge includes a first set of at least two magnetoresistance elements, a second set of at least one magnetoresistance element, a third set of at least one magnetoresistance element and a fourth set of at least one magnetoresistance element. An average reference direction of the first set of at least two magnetoresistance elements is equal to an average reference direction of the third set of at least one magnetoresistance element. An average reference direction of the second set of at least one magnetoresistance element is equal to an average direction angle of the fourth set of at least one magnetoresistance element.

Reducing angle error in a magnetic field angle sensor

A magnetoresistance assembly can include a substrate and a first GMR element disposed over the substrate, the first GMR element having a bottom surface and top surface. The magnetoresistance assembly can further include a first TMR element disposed over the substrate, the first TMR element having a top surface and a bottom surface, wherein a line perpendicular to and intersecting the top or bottom surface of the first TMR element intersects the first GMR element. The first GMR element and the first TMR element are in electrical communication.

Magnetoresistance assembly having a TMR element disposed over or under a GMR element

Methods and apparatus for providing data transfer with a drive coil to transmit information, a receive coil magnetically coupled to the drive coil, and a first magnetoresistive sensor proximate the receive coil to detect information from the receive coil. In embodiments, the drive and receive coils are separated by an isolation material. In embodiments, a signal isolator IC packages includes transmit and receive coils and a magnetic field sensing element coupled to the receive coil.

Isolated data transfer system

A magnetic field sensor includes at least one coil responsive to an AC coil drive signal; at least two spaced apart magnetic field sensing elements responsive to a sensing element drive signal and positioned proximate to the at least one coil; and a circuit coupled to the at least two magnetic field sensing elements to generate an output signal of the magnetic field sensor indicative of a difference between a distance of a conductive target with respect to each of the at least two spaced apart magnetic field sensing elements.

Coil actuated position sensor with reflected magnetic field

Systems and methods described herein provide a current sensor based on magnetic field detection having multiple sensor arrangements with multiple, different sensitivity ranges. The outputs of the multiple sensor arrangements can be combined to generate a single output signal. The current sensor can include two or more sensor arrangements, each having one or more magnetic field sensing elements, and configured to sense a magnetic field in different first measurement ranges corresponding to different ranges of currents through the conductor and further configured to generate different magnetic field signals indicative of the sensed magnetic field in the respective measurement range. The current sensor can include a circuit configured to generate an output signal indicative of a combination of the different magnetic field signals that corresponds to the current through the conductor.

Current sensor having multiple sensitivity ranges

An NMR spectroscopy system for studying a region of a sample to be analysed, includes a magnetoresistive transducer made up of superposed planar layers, which receives a response signal of the sample; a system for making an AC current flow, at a supply frequency f, through the transducer; a system for generating a magnetic field Hthat is constant and uniform throughout a zone of interest in which the sample and transducer are placed; and an exciting coil to generate a magnetic field Hthat is uniform throughout the zone of interest and that varies at a resonant frequency f; the field His substantially perpendicular to the layers of the transducer. The system further includes a regulating system to ensure that the field Hand the planar layers remain orthogonal, and a system for detecting a signal of frequency f&#x2212;f, f&#x2212;for f+f.

NMR spectroscopy system

An apparatus comprises a conductive material having varying thickness along its length, the varying thickness providing varying response along a length of the conductive material to a magnetic field having a non-zero frequency; wherein the magnetic field produces an eddy current in the conductive material which generates a reflected magnetic field, wherein the varying response causes the reflected magnetic field to vary in strength along the length of the conductive material. The apparatus may include one or more reference portions of conductive material.

A magnetoresistance element has a pinning arrangement with two antiferromagnetic pinning layers, two pinned layers, and a free layer. A spacer layer between one of the two antiferromagnetic pinning layers and the free layer has a material selected to allow a controllable partial pinning by the one of the two antiferromagnetic pinning layers.

Magnetoresistance element with improved response to magnetic fields

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Orsay, France

Claude Fermon