Magnetorelaxometry of magnetic nanoparticles in magnetically unshielded environment utilizing a differential fluxgate arrangement

Ludwig, F.; Mäuselein, S.; Heim, E.; Schilling, M.
October 2005
Review of Scientific Instruments;Oct2005, Vol. 76 Issue 10, p106102
Academic Journal
A magnetorelaxometry system based on a differential fluxgate arrangement is presented. Compared to the single fluxgate setup, the use of two fluxgate magnetometers increases the relaxation signal from the sample by a factor of 2, the signal-to-noise ratio by a factor √2, and allows one to perform magnetorelaxation measurements without any magnetic shielding. For a sample with superparamagnetic Fe3O4 nanoparticles and a volume of 150 μ1, 100 nmol Fe could be detected, limited by the intrinsic noise of the fluxgate sensors.


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