Signal and noise characteristics of thin film media estimated by magnetic force microscopy

Author

Honda, Yukio ; Hirayama, Yoshiyuki ; Inaba, Nobuyuki ; Ito, Kenya ; Futamoto, Masaaki

Author_Institution

Central Res. Lab., Hitachi Ltd., Tokyo, Japan

Volume

35

Issue

5

fYear

1999

fDate

9/1/1999 12:00:00 AM

Firstpage

2682

Lastpage

2684

Abstract

An analytical magnetic force microscopy has been applied to investigate the relationship between the media S/N and the microscopic magnetization irregularities of CoCr-alloy longitudinal and single-layer perpendicular media recorded at linear densities up to 450 kFCL. When the S/N is compared between longitudinal and perpendicular media, a 16-nm-thick CoCrPt longitudinal medium shows a little higher S/N than that of a heat-treated 25-nm-thick CoCrTa perpendicular medium. The medium S/N is found to deteriorate with increasing the size and the number of magnetization transition irregularity

Keywords

chromium alloys; cobalt alloys; magnetic force microscopy; magnetic recording noise; magnetic thin films; perpendicular magnetic recording; CoCr alloy thin film; CoCrPt; CoCrTa; heat treatment; longitudinal recording; magnetic force microscopy; magnetization transition; perpendicular recording; signal/noise ratio; Magnetic analysis; Magnetic films; Magnetic force microscopy; Magnetic forces; Magnetic noise; Magnetic recording; Magnetization; Noise reduction; Perpendicular magnetic recording; Signal analysis;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.800948

Filename

800948