High Purity Polyimide Undercoat to Enhance Magnetic Properties and Corrosion Protection for Thin and Thick Film Recording Disks
Original Publication Date: 1982-Apr-01
Included in the Prior Art Database: 2005-Feb-09
The present aluminum substrate used for recording disks has a very large grain size which induces corrosion in the device structure. Also, the undercoat material used to protect the surface from corrosion is highly stressed and causes non-reproducibility of the magnetic properties (metal-to-metal contact diffusion and galvanic coupling).