To provide a composite magnetic grain power which is superior in durability, capable of improving a magnetic head in cleaning properties, and suitable for the magnetic recording layer of a magnetic recording medium.
Fine grain powder of one or more compounds, selected from among nitride, carbide or sulfide of aluminum, zirconium, cerium, titanium, silicon, boron or molybdenum and 0.001 to 0.07 μm in average grain diameter is fixed on the surface of magnetic grain powder 0.01 to 0.3 μm in average grain diameter by a silicon compound, is produced from tetraalkoxylane for the formation of composite magnetic gain powder. A fine grain power of 0.1 to 20 wt.% to the magnetic grain powder is used for the formation of the composite magnetic grain powder used for a magnetic recording medium.
OSUGI MINEKO
KAMIGAKI MAMORU
MORII HIROKO
