Title :
Surface properties of Co-γFe2O3 particles for digital recording
Author :
Cavallotti, J.L. ; Nobili, L. ; Garbarino, S. ; Terrenzio, E. ; Visigalli, P.
Author_Institution :
Dipartimento Chimica Fisica Appl., Politecnico, Milan, Italy
fDate :
1/1/1990 12:00:00 AM
Abstract :
Commercial cobalt-iron-oxide particles for digital applications have been examined by several techniques: physisorption, mercury porosimetry, and electron microscopy. Surface properties, in particular acicularity and heterogeneity, are related to the rheological behavior of the powders, to their magnetic characteristics, to the characteristics of draw-down coatings, and to the response of experimental floppy disks at predetermined recording frequencies. Particles showing high and uniform dispersibility have a narrow particle size distribution and a relatively large number of high-energy sites
Keywords :
cobalt; electron microscope examination of materials; ferrites; iron compounds; magnetic properties of fine particles; magnetic recording; magnetic surface phenomena; particle size; porosity; powder technology; Fe2O3:Co; Hg porosimetry; acicularity; digital recording; draw-down coatings; electron microscopy; floppy discs response; gamma Fe2O3:Co particles; heterogeneity; high-energy sites; magnetic characteristics; magnetic particles; narrow particle size distribution; physisorption; powder rheological behaviour; surface properties; Digital recording; Floppy disks; Iron; Magnetic properties; Magnetic separation; Mercury (metals); Powders; Scanning electron microscopy; Temperature; Testing;
Journal_Title :
Magnetics, IEEE Transactions on
