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Abstract
Non-magnetic particles such as acicular hematite particles with finer size and higher dispersibility are required to produce multi-layered magnetic recording media with better performance. The specific surface area and primary particle size of non-magnetic acicular hematite particles were controlled by adjusting the heating conditions in the dehydration process. A sintering-parameter (SBET/STEM) was defined as the ratio of specific surface area measured by B. E. T. method to the specific surface area calculated from the particle size determined by TEM observation. The lower surface roughness of non-magnetic substrate is used to express the dispersibility of hematite particles. For 1.0≤SBET/STEM≤1.4, the dispersibility of hematite particles was much better in non-magnetic lacquer. When the optimum heating condition was applied to make hematite particles, the lower surface roughness was attained by using finer particles.
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