Abstract
In the fabrication of Co-Cr films with a continuous vacuum-deposition system, the incident angle of the vapor beam on the substrates affects the recording characteristics of the films with respect to the specing loss. The spacing loss factor rises with an inctease in the anisotropy field Hkeff of the film when signals are recorded and reproduced with a ring-type head. For Co-Cr films deposited with the incident angle varying from 20° to -20°, the spacing loss is large, with a factor of 140, while for the films deposited with the incident angle varying from 55° to 20° and from 70° to 20°, the factors are estimated to be 110 and 85, respectively. The former is approximately the same as the value reported in longitudinal recording. The head-to-medium spacing of 40 nm is occupied by a protective layer and a protrusion, which are indispensable for ensuring the durability and playability of the tapes in VCR use. Consequently, films deposited with incident angles varying from 55° to 20° are advantageous high-density recording.
