Electronic Microscopy Microstructural Study of the Transmission of Nanocrystalline Magnetic Materials

Abstract

A systematic microstructural study of two type of magnetic materials is presented: 1) Hard magnetic materials with a submicronic microstructure and 2) nanosized particle systems with a supersoft ferromagnetic or a superparamagnetic response. The common point is the study, by transmission electron microscopy (TEM), of magnetic materials showing the occurrence of a nanometric microstructure. The microstructure is essential in determining the magnetic behavior where intrinsic properties cease to be so when the grain size decreases to a few nanometres. The studied systems include the hard magnets HDDR-NdFeB system, the nanoparticle system of Ba-M hexaferrite under different synthesis conditions, the superparamagnetic Co-Cu system.