Magnetic Dynamics of Nanoscale Magnets: From Classical to Quantum

The various uncommon properties of magnetic nanoparticles (Stoner nanoparticles) and molecular magnets have attracted much attention in industry as well as in the academic community. In this review we begin with going through important experiments in this field and possible applications of these materials. Then we introduce the theoretic models currently used for Stoner nanoparticles and molecular magnets respectively. They are the Stoner-Wohlfarth model and the Landau-LifshitzGilbert(LLG) theory in the former case and the quantum macrospin model for the latter one. In the end we give a brief discussion on the shortcomings of these models and propose a possible approach to build a mesocopic magnetic dynamical theory.