Physics
Scientific paper
Jul 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981pepi...26...98s&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 26, Issue 1-2, p. 98-106.
Physics
28
Scientific paper
The domain structure of natural pyrrhotite grains in a Devonian diabase was studied with the Bitter pattern technique. Examples are shown of the domain structure of large (d > 100 μm) true multidomain grains, intermediate (10 < d < 40 μm) pseudo-single-domain grains and ore grains with less than four domains down to the transition from the two-domain to the single-domain state.
Plate-shaped domains prevail for all sizes of ore grains. Closure domains are only rarely formed. Non-magnetic inclusions and surface irregularities impede the domain wall mobility as expected, resulting in an often quite considerable spread of muscopic coercive forces in the large grains.
Intergrowths of chemically only slightly different phases of pyrrhotite, which cannot be distinguished in a reflected-light muscope, seem to be responsible for entirely stationary ``pseudo-domain walls''.
In low DC fields, domain wall displacements as well as spin rotations within the basal plane of easy magnetization are probably the dominant magnetization processes in pseudo-single-domain and multidomain particles.
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