Study of the origin of orientation ratio in high-density longitudinal magnetic recording media

Author

Ajan, Antony ; Acharya, B.R. ; Abarra, E.N. ; Okamoto, I.

Author_Institution

Storage Syst. Lab., Fujitsu Labs. Ltd., Atsugi, Japan

Volume

37

Issue

4

fYear

2001

fDate

7/1/2001 12:00:00 AM

Firstpage

1508

Lastpage

1511

Abstract

A study on the origin of orientation ratio in high-density recording media on mechanically textured substrates is reported. C-axis distribution of Co grains in textured case observed using high resolution TEM images shows its preferred orientation along the circumferential (along the groove) direction. The asymmetrical easy axis distribution is seen by maximum torque observed in different directions along the plane of the film. Diffraction patterns from several individual grains of the Cr underlayer are analyzed and indicated the preference of Cr ⟨110⟩ along the circumferential direction. This could be the reason for C-axis of Co grains to show the preferred anisotropy along circumferential direction

Keywords

boron alloys; chromium alloys; cobalt alloys; coercive force; magnetic recording; magnetic thin films; platinum alloys; sputtered coatings; texture; torque; transmission electron microscopy; CoCrPtB; asymmetrical easy axis distribution; c-axis distribution; circumferential direction; coercivity; high resolution TEM; high-density recording media; longitudinal magnetic recording media; maximum torque; mechanically textured substrates; orientation ratio origin; preferred orientation; sputtered films; underlayer growth; Anisotropic magnetoresistance; Chromium; Coercive force; Diffraction; Magnetic anisotropy; Magnetic recording; Magnetization; Perpendicular magnetic anisotropy; Torque; Transmission electron microscopy;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.950885

Filename

950885