LOCAL MAGNETIC MICROSCOPY BY INTEGRATION OF MAGNETORESISTIVE SENSORS

LOCAL MAGNETIC MICROSCOPY BY INTEGRATION OF MAGNETORESISTIVE SENSORS Nanomagnetism and Oxides laboratory DSM/IRAMIS/SPEC CEA Saclay, 91191 Gif sur Yvette Cedex, France | PAGE 1

NANOMAGNETISM AND OXIDES LABORATORY Development and characterization of magnetic sensors based on spin electronics For various applications: - Health (MRI, MEG imaging) - Magneto-physiology - Biochips - Space applications, security - NDT - General use applications as automotive (industrial partners commercialize our technologies) 2

3 WHAT IS A MAGNETORESISTIVE SENSOR Element based on the spin electronics Free layer (Hc small) Metallic spacer => Giant magnetoresistance (GMR) Hard layer (Hc high) Insulating barrier => Tunnel magnetoresistance (TMR) Detectivity limit (T/√Hz): 3

INTEREST OF MAGNETORESISTIVE SENSORS Sensitivity Hall effect 1 µT =10 -6 T 1 n. T =10 -9 T Spin-electronics (GMR, TMR) 1 p. T =10 -12 T Fluxgate Mixed sensors SQUIDs 1 f. T =10 -15 T µm mm cm Size | PAGE 4

PROJET : MAGNETIC MICROSCOPE MR-SPM n. T sensitivity quantitative easy use DC and AC 3 D probe Internships: Fabrication Characterization Setup development Simulation Résolution 1µm-100 nm Résolution 100µm-10µm Application to magnetic material properties (steel), nanoparticule, curent line measurement, paleomagnetism, … 5