Characterization of magnetic nanoparticles by a modular Hall magnetometer

The magnetization of iron oxide, nickel and cobalt ferrite nanoparticles was successfully measured by using a modular magnetometer. The magnetometer was built by combining stand-alone equipments usually available at most laboratories such as a Gaussmeter, an electromagnet, a current source and a linear actuator. The magnetic moment sensitivity attained was about 10⁻⁶ Am² and the results were checked against measurements made on commercial VSM and SQUID magnetometers showing few percent errors.