Columnar structure and some properties of metal-evaporated tape

Metal Evaporated Video Tape (ME Tape) has been developed for highly competitive and innovative mass-produced VTRs. A magnetic recording layer of Co-Ni film of 0.15 μm was prepared by vacuum roll coating technology in an oxygen atmosphere using polyester substrate. The shape of the columnar grains forming the film is influenced by this deposition system which has a continuously varied incidence and deposition rate. The anisotropic columnar structures and properties of the ME Tape were investigated. The magnetic properties of a series of films made by varying the minimum incident angle were investigated and the results of the magnetic anisotropies and different recording characteristics of different tape transport directions are presented here. On the other hand, the still-frame life and the frictional behavior of ME Tape has shown no anisotropies for tape transport.