Hysteresis properties of titanomagnetites: Grain-size and compositional dependence

Details Hysteresis properties of titanomagnetites: Grain-size and compositional dependence Hysteresis properties of titanomagnetites: Grain-size and compositional dependence

Jan 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977pepi...13..260d&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 13, Issue 4, p. 260-267.

Physics

444

Scientific paper

Sized fractions of x = 0.6, 0.4, 0.2 and 0.0 titanomagnetites were studied with a vibration magnetometer. In the course particles (d > 150 μm), no compositional dependence of hysteresis parameters was found. HC was less than 50 Oe, HR/HC > 4 and JR/JS < 10-2, reflecting multi-domain behaviour. In contrast, fine particles (d ⋍ 0.1 μm) revealed systematic grain-size dependence of parameters with coercive force as high as 2,000 Oe in x = 0.6 titanomagnetite. Grain-size dependence studies revealed broad transition sizes for the onset of true multi-domain behaviour depending upon which factor is chosen. In magnetite it varies from 10 to 20 μm. The experimental critical size for single-domain behaviour for magnetite is about 0.1 μm and for x = 0.6 titanomagnetite 1-2 μm.

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