Recording layer influence on the dynamics of a soft underlayer

Author

Litvinov, Dmitri ; Lyberatos, Andreas ; Wolfson, Jason ; Bain, James ; Khizroev, Sakhrat

Author_Institution

Seagate Res., Pittsburgh, PA, USA

Volume

38

Issue

5

fYear

2002

fDate

9/1/2002 12:00:00 AM

Firstpage

1994

Lastpage

1996

Abstract

This paper addresses the recording layer influence on the dynamics of soft underlayer (SUL) films. The static magnetic properties of soft magnetic films magnetostatically coupled to hard magnetic layers are correlated with their dynamic characteristics. The dynamic behavior is studied both theoretically and via direct experimental observation of the magnetization switching in a soft underlayer driven by a recording head. It is found that the dynamics of a SUL can be strongly influenced by magnetostatic coupling to a recording layer.

Keywords

Kerr magneto-optical effect; coercive force; magnetic hysteresis; magnetic multilayers; magnetic switching; perpendicular magnetic recording; soft magnetic materials; M-H loops; NiFe-Ta-CoCrTa; coercivity; dynamic characteristics; hard magnetic layers; magnetization switching; magnetostatic coupling; micromagnetic model; permalloy film; perpendicular magnetic recording; recording head; recording layer influence; scanning Kerr microscopy; soft magnetic films; soft underlayer dynamics; static magnetic properties; time-resolved Kerr imaging; Coercive force; Couplings; Magnetic anisotropy; Magnetic films; Magnetic heads; Magnetic properties; Magnetic recording; Magnetostatics; Perpendicular magnetic recording; Soft magnetic materials;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2002.801799

Filename

1042069