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

Volume

39

Issue

5

fYear

2003

Firstpage

2338

Lastpage

2340

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, H_c, 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;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2003.816290

Filename

1233069