Title :
Perpendicular Anisotropy Master Medium in Magnetic Printing for Writing High-Density Servo Signal
Author :
Sheeda, N. ; Nakazawa, M. ; Konishi, H. ; Komine, T. ; Sugita, R.
Author_Institution :
Dept. of Media & Telecommun. Eng., Ibaraki Univ., Hitachi, Japan
Abstract :
A perpendicular anisotropy master medium (PAMM) has been proposed for magnetic printing, and it is expected to improve the printing characteristics of the servo signal. In this study, we experimentally performed magnetic printing by using the PAMM, which is composed of CoPt magnetic film, with perpendicular magnetic anisotropy and large saturation magnetization. It is clarified that the optimum printing field for PAMM is 3.5 kOe, which is 0.5 kOe lower than that of conventional master medium, and that the output signal from the slave medium printed by PAMM is about twice larger than that of the conventional master medium. Furthermore, the printing characteristics for PAMM can be further improved with thicker magnetic film.
Keywords :
cobalt alloys; magnetic thin films; perpendicular magnetic anisotropy; platinum alloys; servomotors; CoPt; high-density servo signal; magnetic film; magnetic printing; perpendicular anisotropy master medium; perpendicular magnetic anisotropy; printing field; saturation magnetization; slave medium; Magnetic printing; perpendicular anisotropic master; servo signal;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2009.2022950
