Title :
Co-Pt-TiO2 composite film for perpendicular magnetic recording medium
Author :
Ariake, J. ; Chiba, T. ; Honda, N.
Author_Institution :
Akita Res. Inst. of Adv. Technol. (AIT), Japan
Abstract :
A new type of oxide composite film was proposed as perpendicular magnetic recording medium. The storage layer is composed of Co-Pt and Ti-oxide. By transmission electron microscopy (TEM) observation, the film exhibited a well isolated fine granular structure with small and uniform Co-Pt grains surrounded by TiO2. More sufficient segregation by TiO2 was realized from the beginning of the layer growth compared with other oxide addition film, resulting in a magnetically weak coupled structure. This film has a relatively large magnetic anisotropy constant (Ku) and saturation magnetization (Ms) of more than 5×106 erg/cm3 and about 800 emu/cm3, respectively. The structure was brought about by a high sputtering gas pressure of Co-Pt-TiO2 film deposition.
Keywords :
cobalt; granular materials; magnetic particles; magnetic thin films; perpendicular magnetic anisotropy; perpendicular magnetic recording; segregation; sputter deposition; titanium compounds; transmission electron microscopy; Co-Pt grains; CoPt-TiO2; TEM; film deposition; film microstructure; granular structure; high sputtering gas pressure; layer growth; magnetic anisotropy; magnetically weak coupled structure; oxide composite film; perpendicular anisotropy; perpendicular magnetic recording medium; saturation magnetization; sputtered thin film; storage layer; transmission electron microscopy; Electrons; Magnetic anisotropy; Magnetic field measurement; Magnetic films; Magnetic materials; Magnetic recording; Perpendicular magnetic anisotropy; Perpendicular magnetic recording; Saturation magnetization; Sputtering; Film microstructure; perpendicular anisotropy; perpendicular magnetic recording medium; sputtered thin film;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2005.854845
