Advanced particulate media for high density DASD

Author

Simmons, R.G. ; Lee, D.L.

Author_Institution

IBM, San Jose, CA, USA

Volume

24

Issue

6

fYear

1988

fDate

11/1/1988 12:00:00 AM

Firstpage

2868

Lastpage

2870

Abstract

Barium ferrite and Co-γFe₂O₃ particles comprise the leading particulate media for high-density direct-access storage devices (DASD). The physical, chemical, and magnetic properties of barium ferrite and Co-γFe₂O₃ particles and media having film thicknesses of 0.25 μm are compared. Magnetic and recording properties of isotropic and longitudinally oriented barium ferrite, Co-γFe₂O₃, and mixtures thereof confirm its potential for high-density DASD. Linear densities (-3 dB) exceeding 1400 fc/mm were achieved without equalization. Barium ferrite media show both particulate and metal-films noise behavior

Keywords

barium compounds; cobalt; ferrimagnetic properties of substances; ferrites; hard discs; iron compounds; magnetic properties of fine particles; magnetic recording; 250 nm; BaFe₁₂O₁₉; Co-Fe₂O₃; DASD; film thicknesses; high-density direct-access storage devices; longitudinally oriented; magnetic properties; metal-films noise behavior; particulate media; recording properties; Barium; Coercive force; Dispersion; Electrons; Ferrites; Magnetic anisotropy; Magnetic recording; Magnetization; Perpendicular magnetic anisotropy; Temperature dependence;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.92271

Filename

92271