Magnetic recording medium and method of producing the same

Abstract

A magnetic recording medium having high C/N ratio characteristics particularly in a short wavelength range and capable of attaining a further higher-density recording as a magnetic recording tape produced by forming a magnetic layer by a vapor deposition method and other magnetic recording media of the next generation and a method of producing the same, wherein a magnetic layer is formed by a vapor deposition method on a nonmagnetic supporting body made of a polymer substrate, which has a configuration of comprising a nonmagnetic supporting body, an under layer formed on the nonmagnetic supporting body, containing Co and O and having an atomic ratio of O/Co of 0.4 or more and a magnetic layer containing Co and O, wherein the film thickness of the under layer is made 50 nm or less and the maximum incident angle is made 70° or less in the vapor deposition method.

1 - 3 . (cancelled)  
     
     
         4 . A method of producing a magnetic recording medium produced by forming a magnetic layer by a vapor deposition method on a nonmagnetic supporting body made of a polymer substrate, comprising the steps of: 
 forming on a nonmagnetic supporting body an under layer containing Co and O and having an atomic ratio of O/Co of 0.4 or more; and    forming a magnetic layer containing Co and O on said under layer.    
     
     
         5 . A method of producing a magnetic recording medium as set forth in  claim 4 , wherein an under layer having a film thickness of 50 nm or less is formed in the step of forming said under layer.  
     
     
         6 . A method of producing a magnetic recording medium as set forth in  claim 4 , wherein the under layer component is deposited with the maximum incident angle of 70° or less with respect to said nonmagnetic supporting body by the vapor deposition method for forming in the step of forming said under layer.