METHOD FOR PRODUCING A MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING MEDIUM SO PRODUCED

摘要

An improved method of producing magnetic thin film with high coercivity and high squareness B-H hysteresis loop for a high density magnetic recording medium is provided by vacuum deposition of Co base binary or ternary alloy systems with Re, Ru or Os as its alloying elements. A co-deposition of cobalt (Co) and rhenium (Re), ruthenium (Ru) or osmium (Os) in a range of alloy composition by a sputtering method on a glass or metallic alloy disk substrate under a range of deposition rate, substrate temperature and sputtering inert gas pressure produces a magnetic thin film medium with a coercive force up to 800 Oe and a squareness ratio of its B-H loop up to 98%. These films can also be produced by de-composition of the alloy elements through other vacuum deposition methods such as electron beam, ion beam and thermal deposition of the alloy at a given range of substrate temperatures and deposition rates.