MAGNETIC RECORDING MEDIUM

摘要

PURPOSE:To provide an isotropic magnetic characteristic to a magnetic recording medium without providing magnetic anisotropy within the magnetic recording medium and to reduce reproduced output modulation by constituting a horizontally magnetizable film layer of a high-speed magnetic permeability material composed of the compsn. contg. nickel and other metallic components and making the content of nickel larger than the content thereof when magnetorestriction is zero. CONSTITUTION:The horizontally magnetizable film layer consists of the compsn. contg. nickel and other metallic components and the content of nickel is made more than the content thereof when the magnetorestriction is zero. The magnetic anisotropy in the direction of a width w1 and longitudinal direction (a) is eliminated in the anisotropic magnetic field dHk=0 (Oe) and the isotropic magnetic characteristic is obtd. The content of Ni is therefore so selected that the isotropic magnetic characteristic of the anisotropic magnetic field Hk=0 (Oe) is obtd. Such content of Ni is 80-82wt% when the horizontally magnetizable film layer is formed of 'Ni-FeMo Supermalloy(R)' and is 81-83wt% when said layer is formed on 'Ni-Fe Permally(R)'.