Matsushita Electric Industrial Co., Ltd.

Kumiko Hirochi

Makoto Kitabatake

Hideaki Adachi

Hidetaka Higashino

Osamu Yamazaki

Shinichiro Hatta

Excellent films of a high Tc superconductor are easily produced on metal coated substrates at a temperature below 700.degree. C. These metal buffer films are made of Pt, Au, Ag, Pd, Ni or Ti. The film superconductivity is significantly improved by the metal buffer layer. Since it is easy to form this metal coating on a substrate, the invention can increase the potential number of usable substrates such as fibers, amorphous solids or semiconductors.

Superconductor

A hard carbon film (12) is formed by ion-beam sputtering on a surface of a substrate (11) such as glass lens or metal sheet of a magnetic disk or a plastic film of a magnetic video tape, by selecting the direction of the ion-beam in the sputtering process to be parallel with surface of the substrate (11) of a magnetic disk, and subsequently theroen a lubricative film (13), such as ZnS.sub.2 is formed also by ion-beam sputtering.

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Moriguchi, Japan

Kumiko Hirochi