Title :
Soft magnetic underlayer with multilayer structure for perpendicular magnetic recording media
Author :
Kong, S.H. ; Okamoto, T. ; Nakagawa, S.
Author_Institution :
Tokyo Inst. of Technol., Japan
Abstract :
Multilayers with nonmagnetic interlayers for the soft magnetic underlayer were prepared in order to improve the soft magnetic properties and surface smoothness as well as reduce the domain configuration. The average size of surface grains decreased from 34 nm for a Ni-Fe single layer to 18 nm for [Ni--Fe/Si]5 multilayer with increasing of number of Si interlayers. In the multilayer structure of [Fe--Co--B/Ni--Fe--O]n, the average surface roughness also decreased. [Ni--Fe/Si]n and [Fe--Co--B/Ni--Fe--O]n multilayers, which exhibited lower coercivity, Hc, had no clear magnetic contrast.
Keywords :
boron alloys; cobalt alloys; coercive force; ferromagnetic materials; grain size; iron alloys; magnetic domains; magnetic multilayers; nickel compounds; perpendicular magnetic recording; silicon; soft magnetic materials; surface topography; FeCoB-NiFeO; NiFe-Si; coercivity; domain configuration; multilayer structure; perpendicular magnetic recording media; soft magnetic underlayer; surface grain size; surface smoothness; Magnetic domain walls; Magnetic domains; Magnetic films; Magnetic multilayers; Magnetic properties; Magnetostatics; Perpendicular magnetic recording; Rough surfaces; Soft magnetic materials; Surface roughness;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2003.816290
