Numerical Analysis of Magnetic Printing by Using a Perpendicular Anisotropy Master Medium

Abstract

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.

Perpendicular Magnetic Printing by Using a Multi-layered Master Medium with Perpendicular Anisotropy

“…~ 5) . 磁気転写におけるマスター媒体に, 垂直磁気異方性CoPt 膜を使用することで, 磁気転写特性が向上することが明らか になっている6) .CoPt 垂直磁気異方性マスター媒体 (以下, 磁性膜が CoPt 膜の みで構成されるマスター媒体を単層マスター媒体と称する) の断面模式図を Fig. 1 に示す.…”

Influence of Initial Magnetization of Master Medium on Magnetic Printing Characteristics

“…1(a)に示す. ビット転写におけ る最適転写磁場は, 面内磁気異方性マスター媒体の場合, 記録層の 保磁力と同程度であり 8) , PAMM の場合はそれより 1 kOe 程度低 い6) . 記録層の保磁力が 4～5 kOe 程度である場合,Fig.…”