Topic, Specialties: PHYSICS
Key words: magnetic sensor, leakage fields
Hosting unit: SPEC/LNO
Magnetic mapping using magnetoresistive magnetic sensors
Abstract
The aim of the internship is to optimize the magnetoresistive sensors, the 3D probe and the scanner of the setup developed in the laboratory and allowing the quantitative and vectorial measurement of leakage fields emitted by various samples ranging from paleomagnetic rocks to RF absorbing materials.
Detailed subject
This internship is part of the ANR MOOSAIC project, which aims to address the problem of non-destructive evaluation of the local magnetic properties (DC and AC) of microstructured, inhomogeneous materials (e.g. paleomagnetic rocks and RF-absorbing petals). It tackles this problem by developing a 3D scanner, consisting of 4 giant magnetoresistance (GMR) sensors, capable of measuring stray magnetic fields emitted by material surfaces in both DC and AC modes, rapidly, vectorially and quantitatively over large areas (several mm² ) with a spatial resolution of ten microns. The aim is to optimize the setup for determining DC and AC magnetic properties, to design a model for reconstructing the field and magnetic properties of the sample, and to apply it to two case studies in geology and physics.
The aim of the internship will be to optimize the GMR sensors and 3D probes used to carry out the magnetic mapping, in terms of leakage field reduction, accuracy of sensor positioning on the probe, stability under temperature and field disturbances, AC measurements, scan height control and determination of the 3D probe sensitivity matrix. GMR deposition and cleanroom fabrication, characterization and optimization by magnetometry, magneto-transport and noise measurements, and 3D probe assembly will be carried out during the internship. Part of the optimization of the setup and its instrumentation may also be carried out during the internship.
Internship location
CEA Saclay, (91) Essonne, France
Internship conditions
- Duration: 6 months
- Level of education required: Bac + 5
- Training : Engineer/Master 2
- Possibility of undertaking a doctoral thesis after the internship: Yes
- Application deadline: February 1, 2026
Skills required
Methods, techniques :
Magnetic mapping, micro-fabrication, instrumentation
Language : English
Useful links
Internship coordinator
Aurélie Solignac
Tel : 0169089540
Email :