Magnetic thin films: The challenge and the opportunity

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Abstract
Current knowledge of film properties and deposition conditions required for high recording density, magnetic thin‐film media will be reviewed. The opportinity to record at linear densities beyond 40,000 flux changes/mm. was demonstrated as early as 1978. The challenge has been, and still is, to identify and control parameters in the deposition process that produce films suitable for high‐density recording at deposition rates practical for commerical production. In general, magnetic thin films suitable for high density recording must be magnetically anisotropic and polycrystalline with coercivities of 300‐1000 Oe. Films with their easy axis of magnetization either parallel or perpendicular to the plane of the film have been shown to be suitable for high density recording. As examples, the recording performance of evaporated CoNi films with their easy axis in the plane of the film will be compared with sputter‐deposited CoCr films, in which the easy axis of magnetization is perpendicular to the film.

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