Duplex coatings for the protection of magneto-optic alloys against oxidation and corrosion

Frankenthal, R. P.; van Dover, R. B.; Siconolfi, D. J.
August 1987
Applied Physics Letters;8/17/1987, Vol. 51 Issue 7, p542
Academic Journal
Thin films of Fe or Co and rare-earth metals, such as Tb and Gd, are being developed as high density, mass memory storage media in magneto-optic devices. It is shown that a 10-nm duplex film consisting of a metal that is passivated in air, such as Cr or Al, and a diffusion barrier, such as Nb, will protect these alloys against oxidation and corrosion at temperatures up to at least 200 °C. The duplex film is better than a single passivated metal layer, which may interdiffuse with the alloy, or than a dielectric, which may be reduced by the reactive rare-earth element.


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