Thin magnetic films of Co-Ni were prepared by vacuum roll coating technologies with O
2 partial pressure using polyester film substrate. The total magnetic flux of these tapes was found to decrease on exposure to high humidity atmosphere. Investigation of sputtered coatings for metal thin film video tape have revealed thinner Si, Ti, Cr, Ni, Zr, Ta, NiO, Cr
2O
3, SiO
2, Si
3N
4, SiC, and TiC films to be an excellent barrier against high humidity corroding, and the protective effect of these sputtered coatings have a superiority compared with the same thickness films prepared by electron beam heated vapor deposition method.
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