METHOD AND ALLOYING ELEMENTS FOR PRODUCING HIGH COERCIVE FORCE AND HIGH SQUARENESS MAGNETIC FILM FOR MAGNETIC RECORDING MEDIUM

摘要

An improved method of producing magnetic thin film with high coercivity and high squareness B-H hysteresis loop for 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 gaspressure produces a magnetic thin film media with coercive force of up to 800 Oeand the squareness ratio of B-H loop up to 98%. These thin alloy films having the high coercive force and squareness ratio can also be produced by Co-deposition 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 substratetemperatures and deposition rates.