Soft underlayer magnetization dynamics

Author

Valcu, Bogdan ; Bertram, H. Neal

Author_Institution

Center for Magnetic Recording Res., Univ. of California, La Jolla, CA, USA

Volume

40

Issue

4

fYear

2004

fDate

7/1/2004 12:00:00 AM

Firstpage

2377

Lastpage

2379

Abstract

A micromagnetic model for the writing process in perpendicular magnetic recording is developed to study the effect of the soft underlayer on the dynamic reversal of the recording layer. The upper part of the soft material is discretized micro-magnetically, each spin following LLG dynamics; the remaining part has infinite permeability. The validity of the model is tested in the static case. Dynamically, high-frequency spin motion is observed in the soft layer. Nevertheless, the field inside the data layer follows the time dependence of the input waveform.

Keywords

magnetisation reversal; micromagnetics; perpendicular magnetic recording; soft magnetic materials; spin dynamics; LLG dynamics; LLG equation; data layer; dynamic reversal; dynamically spin motion; high-frequency spin motion; infinite permeability; input waveform; magnetization dynamics; micromagnetic model; micromagnetically discretization; perpendicular magnetic recording; recording layer; soft material; soft underlayer; time dependence; writing process; Geometry; Magnetic flux; Magnetic heads; Magnetic materials; Magnetization; Micromagnetics; Mirrors; Perpendicular magnetic recording; Soft magnetic materials; Writing; LLG equation; perpendicular recording; soft underlayer;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2004.832671

Filename

1325510