Title :
Advanced particulate media for high density DASD
Author :
Simmons, R.G. ; Lee, D.L.
Author_Institution :
IBM, San Jose, CA, USA
fDate :
11/1/1988 12:00:00 AM
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;
Journal_Title :
Magnetics, IEEE Transactions on
