Determination of switching field distributions for perpendicular recording media

Author

Van de Veerdonk, René J M ; Wu, Xiaowei ; Weller, Dieter

Author_Institution

Seagate Res., Pittsburgh, PA, USA

Volume

39

Issue

1

fYear

2003

fDate

1/1/2003 12:00:00 AM

Firstpage

590

Lastpage

593

Abstract

We present a novel experimental method to determine the switching field distribution in perpendicular thin-film magnetic recording media. The method assumes a constant demagnetization factor independent of the magnetic state during switching and a log-normal switching field distribution. The new technique allows a deconvolution of the effects of the switching field distribution and demagnetization, which is important for the development of low-noise perpendicular magnetic recording media. Results are discussed for a series of recoil loop measurements for a perpendicular CoCrPt alloy medium.

Keywords

Kerr magneto-optical effect; chromium alloys; cobalt alloys; deconvolution; demagnetisation; ferromagnetic materials; iterative methods; log normal distribution; magnetic recording noise; magnetic switching; magnetic thin films; perpendicular magnetic recording; platinum alloys; remanence; CoCrPt; CoCrPt alloy medium; DCD curve; constant demagnetization factor; deconvolution; log-normal switching field distribution; low-noise perpendicular magnetic recording media; perpendicular thin-film magnetic recording media; polar MOKE system; recoil loops; self-consistent iterative procedure; switching field distribution; Deconvolution; Demagnetization; Magnetic field measurement; Magnetic films; Magnetic recording; Magnetic switching; Magnetization; Magnetostatics; Perpendicular magnetic recording; Remanence;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2002.806339

Filename

1179926