High-Density Recording Characteristics of Obliquely Oriented Particulate Magnetic Tapes by Removalof Dis-oriented Surface Layer

Abstract

For high-density, Wide-bandwidth, and highoutput characteristics, a magnetic tape should have a high Bs, a perpendicular orientation, a smooth surface, a good head contact, and a small longitudinal component. By using alongitudinally oriented at inside layer and perpendicularly oriented at surface layer (LIPS) orienting process, we have made obliquely oriented magnetic tapes with metal acicular particles, of which a tape oriented at 45 degrees had the widest-bandwidth characteristics. But large output improvement was not obtained because of the existence of disoriented particles in the surface layer as a result of a calender treatment. We tried to remove the surface layers with polishing sheets. An obliquely oriented tape (45 degrees) improved shortwavelength outputs (10 dB higher at 0.3 μm) after the thickness of the disorientedlayers was reduced by 0.12 μm