Monodomain behaviour in multiphase oxidized titanomagnetite |
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Authors: | J.B. O Donovan,W. O Reilly |
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Affiliation: | Department of Geophysics and Planetary Physics, School of Physics, The University of Newcastle upon Tyne, Newcastle upon Tyne, NE1 7RUGreat Britain |
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Abstract: | Large grains, of the order of tens of microns in size, of synthetic titanomagnetite have been oxidized to produce an intergrowth of phases, essentially similar to that produced by the natural process of deuteric oxidation. The scale of the intergrowth is at the limit of the optical range but the electron microscope reveals the characteristic lamella microstructure. The magnetic hysteresis properties of the most highly oxidized material, having probably about 10% of residual spinel phase, are typical of dispersed monodomain magnetite rods. The investigation therefore supports the model in which it is proposed that titanomagnetite grains in a slowly cooled basalt may carry a highly stable component of natural remanent magnetization. |
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