Physics
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pepi...76..151z&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 76, Issue 1-2, p. 151-162.
Physics
7
Scientific paper
Several types of massive natural pyrrhotites were characterized using low-field magnetic susceptibility and its anisotropy (AMS), thermomagnetic analysis and the colloid method. The pyrrhotites studied differed in the concentration of the ferrimagnetic (Fe7S8) phase (ranging from 100 to 5%), this phase being microscopically intergrown with the antiferromagnetic (Fe9S10) phase. An artificial specimen containing powdered pyrrhotite dispersed in a diamagnetic material was prepared from each pyrrhotite type; hysteresis curves of isothermal remanent magnetization (IRM) and AMS were measured on these specimens. The IRM induced in a 1 T field and the mean bulk susceptibility (k) of dispersed pyrrhotite specimens decrease with decreasing ferrimagnetic phase concentration in the pyrrhotites studied as follows: (1) the IRM (1 T) values range from 30.8 to 1.4 kA m-1 (2) the k values range from 217 × 10-3 to 7.1 × 10-3. During magnetization, AMS was induced in dispersed pyrrhotite specimens (which were nearly isotropic in their original state).
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