Intitulé de l'offre : PhD student Electronics and Instrumentation (H/F)
Référence : UMR6072-SOPRAS-008
Nombre de Postes : 1
Lieu de travail : CAEN
Date de publication : mercredi 17 mai 2023
Type de contrat : CDD Doctorant/Contrat doctoral
Durée du contrat : 36 mois
Date de début de la thèse : 2 octobre 2023
Quotité de travail : Temps complet
Rémunération : 2 135,00 € brut mensuel
Section(s) CN : Micro and nanotechnologies, micro and nanosystems, photonics, electronics, electromagnetism, electrical energy
Description du sujet de thèse
The PhD student will join the research laboratory GREYC in Caen (France), where he/she will work on the fabrication of high sensitivity magnetoresistive sensors. The work concerns the optimization and the fabrication of the magnetoresistive sensing element as well as the low noise electronic conditioning system. Parameters (such as film thickness, geometry of the sensing element, substrate, local nano-patterning, etc) that control the amplitude of the AMR effect will be investigated. Part of the work will be conducted in clean room for all the fabrication steps from thin film deposition, patterning and deposition of electrical contacts.
He/she will work in close collaboration with researchers at SPINTEC lab in Grenoble for the conception and the fabrication of the magnetic flux concentrators. Short stays at SPINTEC are envisaged during the duration of the PhD thesis. Soft magnetic materials will be studied and deposited by electrodeposition. The work on the magnetic flux concentrators will include the modelling and the comparison of different material compositions and designs.
Then, the gain and the influence of the concentrator on the noise of the magnetoresistive element placed in the air gap will be measured and a step of optimization of the LSMO AMR design and of the material of the magnetic flux concentrators will then be necessary to minimize the noise added - by the concentrator
Contexte de travail
The rapid development of our connected world engenders a strong demand for magnetic sensing. Spintronics-based sensors are indeed already widely implemented for automotive, energy, consumer electronics, health and defence applications thanks to their high sensitivity, micron size, CMOS process compatibility and low cost .
Increasing sensitivity of magnetic spintronic sensors is an essential issue to widen their field of applications, in particular towards the biomedical sector. One of the possible way to achieve this is to introduce high gain (>100) magnetic flux concentrators to the magnetic sensing elements. The gain of a concentrator depends directly on its design and the material composition.
GREYC has been working for several years on the development of anisotropic magnetoresistive sensors based on La2/3Sr1/3MnO3 (LSMO) thin films on vicinal SrTiO3 substrates . As shown in figure 1, magnetic detectivity levels of the order of 200 pT.Hz-1/2 have been measured (at 310K, beyond 1 kHz, at 20 V bias) in Wheatstone bridge geometries , , . SPINTEC is currently developing flux concentrators by electrodeposition of NiFe in a thick resist mold .
The objectives of the proposed PhD thesis will be to design and add magnetic flux concentrators to the LSMO AMR sensors based on the previous expertise of the two laboratories engaged in the national project PEPR SPIN on this topic.
Le poste se situe dans un secteur relevant de la protection du potentiel scientifique et technique (PPST), et nécessite donc, conformément à la réglementation, que votre arrivée soit autorisée par l'autorité compétente du MESR.
Contraintes et risques
Location: GREYC (CNRS UMR6072) – ENSICAEN – Univ. Caen Normandie (France)
Start: September/November 2023 Duration: 36 months