Microscopic noise and signal characteristics of perpendicular recording medium studied by magnetic force microscopy

Author

Honda, Y. ; Hirayama, Y. ; Ito, K. ; Futamoto, M.

Author_Institution

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

Volume

33

Issue

5

fYear

1997

fDate

9/1/1997 12:00:00 AM

Firstpage

3076

Lastpage

3078

Abstract

Signal and noise characteristics around the recorded track edges of a CoCrTa perpendicular medium are investigated in a microscopic scale by magnetic force microscopy coupled with Fourier-analysis. The noise level within the recorded region is higher than that of DC erased region, and the medium noise near the both track-edges is higher than that measured at the recorded track center. Sharp off-track overwrite profiles are confirmed when the low-frequency signal (45 kFCI) is off-track overwritten by the high-frequency signal (200 kFCI)

Keywords

Fourier analysis; chromium alloys; cobalt alloys; magnetic force microscopy; magnetic recording noise; perpendicular magnetic recording; tantalum alloys; CoCrTa; Fourier analysis; magnetic force microscopy; microscopic noise; off-track overwrite profile; perpendicular recording medium; signal characteristics; track edge; Couplings; Density measurement; Force measurement; Low-frequency noise; Magnetic force microscopy; Magnetic forces; Magnetic heads; Magnetic noise; Noise level; Noise measurement; Perpendicular magnetic recording; Saturation magnetization;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.617849

Filename

617849