Acicular Fe-Co alloy particles are one of the candidates for high-density magnetic recording media. We examined the effects of Co additions on the magnetic properties of Fe-Co alloy particles by using Mossbauer spectroscopy, TEM, and X-ray diffraction...
Acicular Fe-Co alloy particles are one of the candidates for high-density magnetic recording media. We examined the effects of Co additions on the magnetic properties of Fe-Co alloy particles by using Mossbauer spectroscopy, TEM, and X-ray diffraction. Acicular Fe_nCo (n=5, 4, 3, 2) alloy particles coated with silica, were prepared by a chemical coprecipitation method and subsequent H₂ reduction. The crystal structure was found to be cubic in all n ranges. The lattice constant α_0 decreases with increasing Co contents. Analysis of (57)^Fe Mossbauer effect data in terms of the local configurations of Co atoms has permitted the influence of magnetic hyperfine interactions to be monitored.