Ferromagnetic Resonance Spectroscopy: Basics and Applications

Ferromagnetic resonance (FMR) uses the same equipment as EPR to study strong interactions between spins characterising crystallised ferromagnetic materials. The parameters describing these very anisotropic interactions are deduced from the variation in the position of the resonance line as a function of the direction of the applied magnetic field. This technique is illustrated by experiments performed on several types of nano structured materials: Fe films deposited by epitaxy on GaAs, thin layers of semiconductors doped with Mn2+ and ferrofluids. Its applications relate to magnetic recording, spintronics, and biomedical fields.