Process of producing master carrier for magnetic transfer

Abstract

A process for producing a master carrier contains steps of: forming a desired pattern on a support to form a resist pattern support; forming a first ferromagnetic thin film on the resist pattern support by a vacuum film forming method; forming a third ferromagnetic thick film on the first ferromagnetic thin film by an electroplating; and peeling the support from the resist pattern support provided with the first ferromagnetic thin film and the third ferromagnetic thick film.

1 . A master carrier, which is produced by process comprising: 
 forming a support having a projection pattern in accordance with a desired information on a surface of said support;    forming a first ferromagnetic thin film on said support having said projection pattern by a vacuum film forming method;    forming a third ferromagnetic thick film on said first ferromagnetic thin film by an electroplating; and    peeling said support from said support provided with said first ferromagnetic thin film and said third ferromagnetic thick film.    
   
   
       2 . The master carrier according to  claim 1 , wherein said third ferromagnetic thick film comprises a nickel.  
   
   
       3 . The master carrier according to  claim 1 , said process further comprising: 
 forming a second ferromagnetic thin film between said first ferromagnetic thin film and said third ferromagnetic thick film by said vacuum film forming method, said second ferromagnetic thin film having a same element as said third ferromagnetic thick film.    
   
   
       4 . The master carrier according to  claim 3 , wherein said second ferromagnetic thin film has a film thickness of 10 nm to 100 nm.  
   
   
       5 . The master carrier according to  claim 1 , wherein said first ferromagnetic thin film has a first saturation magnetization, and said third ferromagnetic thick film has a third saturation magnetization; and a ratio of said first saturation magnetization to said third saturation magnetization is 1 or more.  
   
   
       6 . A magnetic transfer medium in which servo information is recorded by a magnetic transfer method using a master carrier that is produced by a process comprising: 
 forming a support having a projection pattern in accordance with a desired information on a surface of said support;    forming a first ferromagnetic thin film on said support having said projection pattern by a vacuum film forming method;    forming a third ferromagnetic thick film on said first ferromagnetic thin film by an electroplating; and    peeling said support from said support provided with said first ferromagnetic thin film and said third ferromagnetic thick film.