Electroless deposition magnetic recording media process and products produced thereby

Abstract From the Canadian patent

Abstract of the Disclosure, A process for producing a high density magnetic storage device such as a rigid memory disc having improved magnetic recording properties including high coercivity high, remanence and improved hysteresis loop squareness. The device is prepared by initially cleaning the surface of a substrate, such as an aluminum disc, zincating that cleaned surface, when applicable electrolessly depositing a non-magnetic, nickel-phosphorus layer thereon which is substantially free of pits and other surface imperfections and which has a nickel content of from approximately 88 to 92 percent and a phosphorus content of from 12 to 8 percent by, weight. The non-magnetic, …