Most of my research is focused on the magnetic properties of very small particles. In particular, I have used Mössbauer spectroscopy for these studies, but often combined with other experimental techniques such as neutron scattering and magnetization measurements, and I have developed theoretical models for the magnetic properties of nanoparticles. Besides, I have used Mössbauer spectroscopy for studies of paramagnetic relaxation, geological samples, silicate glasses, catalysts, etc.