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Hysteresis properties of titanomagnetites: Grain-size and compositional dependence

Authors:	R Day M Fuller VA Schmidt

Institution:	1. Department of Geological Sciences, University of California, Santa Barbara, Calif. 93106, U.S.A.;2. Department of Earth and Planetary Sciences, University of Pittsburgh, Pittsburgh, Pa. 15213, U.S.A.

Abstract:	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. H_C was less than 50 Oe, H_R/H_C > 4 and J_R/J_S < 10^?2, reflecting multi-domain behaviour. In contrast, fine particles ( $d ? 0.1 μ m$ ) 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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