Effects of 2 Step Crystallizing Process on Barium Ferrite Particles in Glass Crystallization Method

抄録

  Effects of 2 step crystallizing process on magnetic properties, particle size distributions, crystallization mechanism were investigated on the basis of glass crystallization method. First annealing temperature was a definite condition to determine the particle size and the switching field distribution(SFD). Fine particles with average diameter in the range from 30 to 40 nm, having narrower SFD than that obtained from conventional one step crystallizing process, were obtained under certain conditions. Those first annealing conditions changed flakes into mixtures of a non-magnetic amorphous state and nano-meter sized particles which magnetic ordering just began to develop.