Title :
CoB/Pd multilayers with PtB/Pd/MgO intermediate layers for perpendicular magnetic recording
Author :
Nakagawa, H. ; Takekuma, I. ; Nemoto, H. ; Takahashi, Y. ; Hirayama, Y. ; Nishida, Y. ; Hosoe, Y.
Author_Institution :
R&D Group Hitachi Ltd., Kanagawa, Japan
Abstract :
CoB/Pd multilayer films with a PtB/Pd/MgO intermediate layer were deposited on a soft-magnetic underlayer or on seeded substrates. A TEM analysis revealed that the multilayer films have a well-separated columnar structure just above an MgO layer. This structure may be initiated by the difference in the wetting nature of nonmetallic MgO and metallic Pd, and may be enhanced by the PtB layer. These boundaries were found to act in reducing the exchange coupling, resulting in an improvement in recording performance.
Keywords :
boron alloys; cobalt alloys; exchange interactions (electron); magnetic multilayers; palladium; perpendicular magnetic recording; platinum alloys; transmission electron microscopy; CoB-Pd; CoB/Pd multilayers; PtB-Pd-MgO; PtB/Pd/MgO intermediate layers; TEM; columnar structure; exchange coupling; perpendicular magnetic recording; perpendicular recording; Atomic force microscopy; Coercive force; Magnetic films; Magnetic multilayers; Magnetic noise; Magnetic properties; Magnetic separation; Nonhomogeneous media; Perpendicular magnetic recording; Sputtering;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2003.816281
