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Sujet de stage / Master 2 Internship

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Development of magnetic sensors reconfigurable by Spin Orbit Torque

Contact: PANNETIER-LECOEUR Myriam, , myriam.pannetier-lecoeur@cea.fr, +33 1 69 08 74 10
Summary:
The goal of the internship is to develop tunneling magnetoresistance (TMR) structures using spin orbit torque to electrically manipulate magnetization and pave the way for reconfigurable magnetic sensors.
Possibility of continuation in PhD: Non
Deadline for application:31/01/2023

Full description:
Magnetic sensors allow to measure both the magnetic field but also associated quantities, such as current or even the position of an object. They are more and more present in technological objects, as well as in the automotive and medical fields.
Spin electronics, whose experimental demonstration was crowned by the Nobel Prize in Physics in 2007 (A. Fert and P. Grünberg), has opened up important avenues of improvement for magnetic sensors thanks to the sensitivity and miniaturization of the basic elements.
However, a current limitation comes from the fact that the sensor is defined at the time of its manufacture and that its characteristics (such as the range, the sensitivity direction...) are thus fixed at the beginning. Thanks to the spin orbit torque (SOT) phenomenon, which consists in applying a magnetic force thanks to a flow of spin-polarized electrons, it is possible to implement in a sprintronic element a function of manipulation of some of the magnetic layers, and thus to imagine a sensor which can adapt itself during its use thanks to the reconfiguration of its references.
The internship will consist in developing Tunnel Magneto-Resistance (TMR) systems integrating a level of SOT to drive the sensor response. This internship is part of the ANR STORM, in collaboration with UMPhy Thales and Crivasense Technlogies. It will include the deposition of materials, their characterization in terms of SOT performance, then the realization of devices by microfabrication techniques, and magneto-transport measurements to evaluate the response of the sensors.
Technics/methods used during the internship:
Microfabrication, magnetotransport measurements, magnetometry.

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