Nanomagnetism & Oxides Laboratory
Local magnetic imaging
People: Aurélie Solignac (Permament staff), Claude Fermon (Permanent staff), Julien Moulin (PhD), Andrin Doll (Postdoc), Fawaz Hamdaded (PhD)
Collaborations: CEA/DRT/LIST Natalia Sergeeva Chollet
Fundings: Nanomag (EMPIR), CALM (Regional Labex NanoSaclay), SNSF postdoctoral grant 

A potential application of magnetoresistive based magnetic sensors is imaging and cartography of local scale magnetic properties. During the last years several such tools were developed. The first one is dedicated to non-destructive testing by eddy currents using a probe composed by four GMRs allowing a 3D reconstruction of the magnetic fields. We are also developing a novel characterization tool of the magnetic properties of materials surfaces, at the nano-scale, by combining magnetoresistive sensors and atomic force microscopy. It will lead to three main innovative applications: magnetic nanometrology, magnetic susceptibility imaging and micro imaging of Nuclear Magnetic Resonance (NMR) signal which will have potential fallout in non-destructive testing of materials or current imaging in high frequency domain. The NMR imaging (MRI) beneficiates from a dedicated work on NMR spectroscopy at the local scale using the miniaturization advantage of magnetoresistive sensors.  
GMR based microscopy : dollar imaging 
Presently we have a resolution of 3µm 
with 3D quantitative imaging. 
The noise level is below 1nT/√Hz 
GMR based microscopy : meteorite imaging
Next step: submicronic resolution magnetic microscopy
Expected performances:
- With a hundred nm range resolution 
- With a detectivity between the nT/√Hz and the pT/√Hz (10-9-10-12 T/√Hz) 
- With a large magnetic frequency range from DC to 10MHz 
- In a quantitative way 
- Without influencing the sample (magnetic field emitted, heating,…) 
- With a simultaneous measurement of the topography 
- With an easy/low cost use and at room temperature