Magnetorelaxometry of Nanoparticles Using a GMI Magnetometer

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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 l) by comparison with reference measurements of the induced magnetic field using fits to the NĂ©el expression for magnetorelaxation.


Document Type: Research Article


Publication date: June 1, 2009

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