MONODISPERSE FERROMAGNETIC PARTICLES FOR MICROWAVE APPLICATIONS

Ferromagnetic metal-based materials display interesting properties for microwave applications. Here the authors report obtaining ferromagnet ic monodisperse particles in the nanometer size range by the polyol pr ocess. By accurate control of the particle size the influence of the p article upon the microwave permeability could be studied. Three differ ent behaviors are detected in a size range varying by over two orders of magnitude, in which the change from a polydomain to a monodomain co nfiguration occurs.