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Surface properties of Co-γFe2O3 particles for digital recording

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5 Author(s)
P. L. Cavallotti ; Dipartimento Chimica Fisica Appl., Politecnico, Milan, Italy ; L. Nobili ; S. Garbarino ; E. Terrenzio
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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

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IEEE Transactions on Magnetics  (Volume:26 ,  Issue: 1 )