CVD Growth of magnetic oxide films having growth induced anisotr

Details CVD Growth of magnetic oxide films having growth induced anisotr CVD Growth of magnetic oxide films having growth induced anisotr

1978-09-29

1980-07-08

Pianalto, Bernard D.

Coating processes

Magnetic base or coating

Magnetic coating

428900, H01F 1002

Patent

active

042118034

ABSTRACT:
A chemical vapor deposition (CVD) process is described for depositing magnetic oxides, such as garnets, having growth induced anisotropy sufficient to support stable bubble domains, even in very thin films. Organometallic source compounds are used together with low growth temperatures less than 900.degree. C. and high nozzle velocities in the range of 200-600 cm/sec. at room temperature. The oxidant gas mixture contains about 30-50 mol percent O.sub.2, rather than approximately 100 mol percent O.sub.2, as is usually used in CVD processes for depositing magnetic garnet films. The gas flow is transverse to the plane of the substrate onto which deposition is to occur, and is preferably perpendicular to the plane of the substrate. The individual source compounds are volatilized and carried by an inert gas, combined, then pre-mixed with oxygen in a nozzle without reaction at about 200.degree.-300.degree. C. The gas mixture is then passed at high velocity (200-600 cm/sec) onto a heated substrate. A novel nozzle-substrate arrangement is used which produces a favorable flow pattern and allows the source gas to be mixed with oxygen just immediately before it strikes the hot substrate. This yields optimum thickness and composition control for the particular substrate geometry used.

REFERENCES:
Besser et al., "Film . . . Garnet Films", pp. 125-129.
Cowher et al., "Epitaxial . . . Vapor Deposition", pp. 621-631, 11-73.
Sadagopan et al., IBM Tech. Dis. Bull., pp. 439-440, vol. 15, No. 2, 7-72.

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