Magnetorelaxometry of Nanoparticles Using a GMI Magnetometer

Basile Dufay (1) , Sébastien Saez (1) , Matthieu Denoual (1) , Christophe Dolabdjian (1) , F. Ludwig (2) , E. Heim (2) , M. Schilling (2) , L. Melo (3) , A. Yelon (3) , D. Menard (3)

1 Equipe Electronique - Laboratoire GREYC - UMR6072
2 Institut für Elektrische Messtechnik und Grundlagen des Elektrotechnik
3 Département de génie physique [Montréal]

We have performed magnetorelaxometry measurements on superparamagnetic magnetite (Fe3O4) nanoparticles using a low-cost custom-made Giant MagnetoImpendance magnetometer. We demonstrate that we are able to evaluate the concentration of nanoparticles in the sample (with a volume of around 150 µl) by comparison with reference measurements of the induced magnetic field using fits to the Néel expression for magnetorelaxation.

Mots clés: GMI MAGNETOMETER; MAGNETIC NANOPARTICLES (MNPS); MAGNETORELAXOMETRY

Domaines: Electromagnétisme

Basile Dufay, Sébastien Saez, Matthieu Denoual, Christophe Dolabdjian, F. Ludwig, et al.. Magnetorelaxometry of Nanoparticles Using a GMI Magnetometer. Sensor letters, 2010, 7 (3), p429-432. ⟨10.1166/sl.2009.1087⟩. ⟨hal-00980166⟩