A technique is described which uses a scanning column magnetometer to
obtain a magnetic profile of a column of dispersion of magnetic record
ing particles. By comparing profiles as a function of time, settling o
f particles can be observed. Analysed data for different dispersions c
an provide a comparison of their stability. The technique has the pote
ntial to combine data with rheological properties and, using hindered
settling theory, to analyse the structure of magnetic particle cluster
s in the dispersion. This will assist in understanding tape-production
processes such as orientation, surface conditioning and drying. (C) 1
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