Magnetorelaxometry of magnetic nanoparticles in magnetically unshielded environment utilizing a differential fluxgate arrangement
Abstract
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 150μl, 100 nmol Fe could be detected, limited by the intrinsic noise of the fluxgate sensors.
- Publication:
-
Review of Scientific Instruments
- Pub Date:
- October 2005
- DOI:
- 10.1063/1.2069776
- Bibcode:
- 2005RScI...76j6102L
- Keywords:
-
- 07.55.Ge;
- 07.07.Df;
- 75.50.Tt;
- 75.20.Ck;
- Magnetometers for magnetic field measurements;
- Sensors;
- remote sensing;
- Fine-particle systems;
- nanocrystalline materials;
- Nonmetals