MAGNETIC RECORDING MEDIUM COMPRISING MULTIPLE THIN FILM MAGNETIC LAYERS EACH FORMED WITHIN SPECIFIED MAXIMUM AND MINIMUM INCIDENT ANGLES

摘要

A magnetic recording medium of the longitudinal recording type is comprised of a magnetic layer on one major surface of a non-magnetic substrate wherein the magnetic layer consists of at least two layers of cobalt-based ferromagnetic metal thin film which are formed by oblique evaporation at an incident angle varying between a maximum theta max and a minimum theta min. Assuming that the layers disposed close to and remote from the substrate are designated lowermost and uppermost layers, respectively, the lowermost layer of ferromagnetic metal thin film is deposited at a smaller theta max value than is the uppermost layer of ferromagnetic metal thin film. The uppermost layer is deposited at a greater theta min value than is the lowermost layer. The medium is improved in corrosion resistance and electromagnetic properties properties.