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A perpendicular anisotropy master medium (PAMM) is proposed. The PAMM is composed of CoPt film with perpendicular magnetic anisotropy and large saturation magnetization. The magnetization distributions of PAMM and conventional master media (using an FeCo soft magnetic layer) were analyzed by using micromagnetic simulation. It was found that the peak-to-valley value of the recording field and the recording field gradient at the edge of the patterned magnetic film of PAMM were larger than those of the conventional master medium. Furthermore, the peak-to-valley value of the recording field and the recording field gradient of PAMM did not depend on the strength of the printing field. The printing characteristic of PAMM is twice that of the conventional master medium. Furthermore, the optimum printing field for PAMM is 1 kOe lower than that of the conventional master medium. As a result, PAMM is expected to improve the printing characteristic of the bit printing method.

Magnetic printing characteristics using a perpendicular anisotropic master medium (PAMM) with various patterns were numerically analyzed. The recording field distribution of PAMM and the magnetization distribution of the recording layer were analyzed by micromagnetic simulation. As a result, the recording field of dot a pattern was about 1 kOe higher than those of line and checker patterns under the same printing field. The magnetic printing with PAMM was found to be applicable to any pattern. When the bit length was not more than 100 nm, the optimum printing field for the dot pattern was 1-2 kOe lower than those of line and checker patterns. The optimum printing field varied according to pattern and bit length.

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