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Univ. Paris-Saclay

Sujet de stage / Master 2 Internship

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Ultra-sensitive magnetometry for medical imaging.

Contact: PANNETIER-LECOEUR Myriam, , myriam.pannetier-lecoeur@cea.fr, +33 1 69 08 74 10
The goal of the internship is to develop, fabricate and test very high sensitivity magnetic sensors co-integrating a superconductor and a spintronic element. The targeted application is magnetic resonance imaging (MRI) at low magnetic field (10mT).
Possibility of continuation in PhD: Oui
Deadline for application:31/03/2021

Full description:
Our laboratory has developed a device called mixed sensor, combining a superconducting pick up loop with a giant magnetoresistance (or GMR) sensor for the measurement of extremely small magnetic signals (a few femtoteslas = 10-15T), such as those produced by the heart or the brain.
We have shown that this type of device can detect magnetic signals due to cardiac electrical activity. This type of sensor can also be very interesting for the measurement of Magnetic Resonance Imaging (MRI) signals.
The magneto-resistive element used so far is a metallic GMR of the spin valve type. Recent progress in the field of spin electronics has made it possible to propose tunnel magnetoresistors (TMR) whose performances are increased especially at high frequency. On the other hand, low-frequency noise reduction techniques can also be applied to achieve excellent sensitivity levels.
The aim of the internship is to participate in the development of these sensors and to test their performance for MRI in the framework of the ANR VLFMRI project.
Technics/methods used during the internship:
microfabrication, magnetotransport and noise measurements at low temperature, magnetic imaging.

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