Abstract

Abstract In order to make clear the effects of a magnetic field on the growth of ultra fine particles, electron microscope studies have been made on iron, cobalt and nickel particles prepared in different magnetic field strengths. The ultra fine particles were arranged in zigzag chains and straight chains. The zigzag chain can be explained by the connection of particles where each particle has a closed magnetic domain. The straight chain can be explained by connection of particles with each particle having a single domain. The strength of the magnetic field appearing in the straight chain was different for the ferromagnetic substances. These differences have been discussed on the basis of the coalescent growth in a smoke and the saturation magnetism of the substance.

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