Concept et développement d'un magnétomètre spintronique : application à la navigation magnéto-inertielle et à la mesure des couples de transfert de spin

Abstract : In this work, we present the conception and the performances of AMR and GMR-based sensors for navigation applications In order to obtain the best sensitivity and linearity at zero field, the design include barberpoles and a Wheatstone bridge for the first and takes advantage of the different anisotropies and coupling for the other. The sensor are fabricated by magnetron sputtering and photolithography and their performances in terms of sensitivity, linearity and noise are compared. The concept of gradiometers used for magneto-inertial navigation is based on the utilisation of magnetoresistances placed at each extremity of the sensor connected by a wheatstone bridge whose output is proportional to the gradient of the magnetic field. Flux concentrators designed to amplify the incoming field in order to improve the sensitivity are fabricated and tested on the sensors. A flux concentrator designed to amplify a magnetic gradient is proposed as an improvement of the gradiometers. Innovant solutions for low consumption anisotropy switching and offset compensation are being experimented using spin Hall effect and spin transfer torque with adjacent Pt and AuW layers. In that regard a spin torque measurement device: the spin-torque-bridge, is designed and used to study the spin hall effect and the spin transfer couplings in different multi layers.
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Augustin Jouy. Concept et développement d'un magnétomètre spintronique : application à la navigation magnéto-inertielle et à la mesure des couples de transfert de spin. Science des matériaux [cond-mat.mtrl-sci]. Université Paris-Saclay, 2018. Français. ⟨NNT : 2018SACLX074⟩. ⟨tel-02064053⟩

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