POWDER FOR LOWER LAYER OF MULTILAYER MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING MEDIUM USING THE SAME

摘要

PROBLEM TO BE SOLVED: To obtain powder having both of preservation stability and surface smoothness of a magnetic recording medium as powder (powder for a lower layer) used for a non-magnetic layer and the like of a multilayer magnetic recording medium. SOLUTION: The powder consists of a non-magnetic iron oxide particles each having an aciculated shape or a shape near thereto. In the powder for the lower layer of the multilayer magnetic recording medium, Zn or Zn and P are present on the surface of the particle. The Zn is contained by 0.1 to 25 wt.% of Fe. COPYRIGHT: (C)2006,JPO&NCIPI