For different medical applications nanoparticles (NPs) with well-defined
magnetic properties have to be used. Coating ligand can change the magnetic
moment on the surface of nanostructures and therefore the magnetic behavior of
the system. Here we investigated magnetic NPs in a size of 13 nm conjugated
with four different kinds of surfactants. The surface anisotropy and the
magnetic moment of the system were changed due to the presence of the
surfactant on the surface of iron oxide NPs