Abstract by Brittni Newbold
Physics and Astronomy
Magnetic Ordering of Magnetite (Fe3O4) Nanoparticle Assemblies
Magnetite nanoparticles have great potential for use in medical and other applications, so understanding their properties is crucial. The goal of this project is to determine how the magnetic ordering in magnetite nanoparticle assemblies changes as a function of nanoparticle size, temperature and external magnetic field. Samples of these nanoparticle assemblies were put through x-ray resonant magnetic scattering which produced scattering images that provide information about the magnetic ordering of the particles. These images were reduced to one-dimensional scattering profiles. By fitting these scattering profiles with a model, we are determining the specific magnetic orderings present in the assemblies and their associated weights. The results of the fits for high temperature show little antiferromagnetic contribution for smaller particles and a small peak in the antiferromagnetic contribution for larger particles as the field value approaches zero.