COMPOUND-DEPOSITED NEEDLE-SHAPED FINE PARTICLES, METHOD OF MANUFACTURING THE SAME, AND USE OF THE SAME

摘要

The needle-shaped fine particles, i.e. (i) iron carbide-containing needle-shaped fine particles, (ii) needle-shaped fine particles containing iron carbide, metallic iron and carbon, or (iii) carbon-containing needle-shaped fine metallic iron particles, on which a compound containing at least one kind of element selected from the elements in the 5th and 6th periods in groups III and IV on the periodic table of elements is deposited, have excellent sintering preventing effect, and accelerate a reducing reaction, thus providing a magnetic recording medium of a high recording density.