| 摘要 |
PROBLEM TO BE SOLVED: To provide a substrate suitable for manufacturing vertical magnetic recording medium which has good signal reproducing characteristic with low noise and a manufacturing method thereof. SOLUTION: On the non magnetic substrate 1, preferably a core forming layer 2 is formed, and a multilayer soft magnetic backing layer 3 including antiferromagnetic film is formed on the layer 2. The soft magnetic backing layer 3 is exchange coupled between the soft magnetic film and the antiferromagnetic film, and has anisotropy in the circumferential direction or radial direction. The antiferromagnetic film is an alloy film preferably including Cr or Mn or metal oxide film except natural oxidization, and is obtained by film forming like plating. Anisotropic processing is carried out by thermal treatment in a magnetic field, and circumferential or radial anisotropy is made by changing the direction of applying the magnetic field, and a magnetic recording layer 5 for vertical magnetic recording is formed on the soft magnetic backing layer 3. Further, a protection layer 6 and a lubricating layer 7 are favorably laminated in order. COPYRIGHT: (C)2008,JPO&INPIT
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