PRODUCTION OF VERTICAL RECORDING MAGNETIC MEDIUM

摘要

PURPOSE:To obtain the intra-surface magnetization anisotropy of a 'Permal loy(R)' film by blanking a double layer film medium of lines of magnetic force into a circle by means of magnets arranged specially, a yoke and a mask when the 'Permalloy(R)' film is formed on a nonmagnetic substrate. CONSTITUTION:The steam supplied from an evaporation source 8 of a crucible 7 is vapor deposited onto a nonmagnetic substrate 9. A 'Permalloy(R)' film is continuously vapor-deposited on the substrate 9. Then the tangent direction of the line 12 of magnetic force is equal to the magnetization easy axis together with the normal line direction equal to the magnetization difficult axis respective ly for the 'Permalloy(R)' film. In other words, the magnetic anisotropy can be freely controlled with the vapor deposition of the 'Permalloy(R)' film using magnets 4. Thus a vertically magnetized film is formed on the substrate 9 containing a 'Permalloy(R)' film for production of a recording medium. This recording medium is blanked into a circle for production a disk medium 13. Thus it is possible to obtain a disk vertical recording magnetic medium having the anisotropy of the magnetization difficult axis to the circumferencial direction of the medium 13.