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When the spinel ferrites present a large surface/volume ratio (i.e when the
y are in the form of thin films or line powders) they can be oxidized into
mixed-valence defect ferrites, These original spinels have magnetic, magnet
o-optical and optical properties making them interesting materials for high
density recording media. (C) 1999 Elsevier Science B.V. All rights reserve
d.