MAGNETIC RECORDING MEDIUM HOLDING LUBRICATING MATERIAL IN CRACK OF CONSTITUTING LAYER

摘要

PURPOSE:To remarkably improve the lifetime by stagnating a lubricating material on the surface of the uppermost layer of constituting layers and impregnating at least part thereof into the cracks formed in the uppermost layer. CONSTITUTION:The lubricating material is stagnated on the surface of the uppermost layer of the constituting layers and at least part thereof is impregnated into the cracks formed on the uppermost layer. The cracks to be formed are provided in a magnetic layer if only the magnetic layer is provided on a base. The cracks are provided in a protective layer or in the protective layer and magnetic layer if the protective layer is provided in combination on the magnetic layer. The cracks may exist nondirectionally and/or in arbitrary directions over the entire region of the constituting layers and the crack density is preferably 100-1,000pieces/mm and the cleavage width of the cracks is preferably 0.05-0.5mum. The org. lubricating material may be in any form of solid, paste or oil.