Recording and transition noise simulations in thin film media

Author

Zhu, Jian-Gang ; Bertram, H. Neal

Author_Institution

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

Volume

24

Issue

6

fYear

1988

fDate

11/1/1988 12:00:00 AM

Firstpage

2706

Lastpage

2708

Abstract

Micromagnetic simulations of the recording of a single transition in thin-film metallic media are presented. The film is modeled as a planar array of hexagonal single-domain particles with long-range magnetostatic as well as possible nearest-neighbor exchange interactions. Magnetization configurations are determined by following the Landau-Lifshitz equations of motion with finite damping. The media parameters used here approximate Co films. The recording geometry resembles a close flying head with a small gap. Transition fluctuations, a source of transition noise, are also suited for both non-exchange-coupled and exchange-coupled media. It is shown that intergranular exchange coupling can significantly enhance transition noise and that films with well defined nonmagnetic grain boundaries exhibit better signal-to-noise ratios

Keywords

magnetic recording; magnetic thin films; magnetisation; metallic thin films; noise; simulation; storage media; Co films; Landau-Lifshitz equations; SNR; exchange-coupled media; finite damping; flying head; hexagonal single-domain particles; intergranular exchange coupling; long range magnetostatic interactions; magnetic storage media; micromagnetic simulations; motion equations; nearest-neighbor exchange interactions; nonexchange-coupled media; nonmagnetic grain boundaries; planar array; recording geometry; signal-to-noise ratios; small gap; thin-film metallic media; transition fluctuations; transition noise simulations; Damping; Elementary particle exchange interactions; Equations; Geometry; Magnetization; Magnetostatics; Micromagnetics; Planar arrays; Signal to noise ratio; Transistors;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.92219

Filename

92219