Physics
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pepi...46...71s&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 46, Issue 1-3, p. 71-76.
Physics
5
Scientific paper
Weak field (or initial) susceptibility is used for a variety of rock magnetic and paleomagnetic purposes. Depending on the instrument used, it may be measured at a variety of field strengths, based on the common assumption that, for sufficiently low fields (less than 0.1 mT or so), the magnetization is linear in the applied field, implying that susceptibility is constant. Measurements of susceptibility of samples of dispersed natural magnetite at field strengths ranging from 0.001 to 0.1 mT show that this assumption is in fact incorrect, with samples ranging in domain state from single domain to large multidomain showing a distinct decrease in susceptibility between 0.001 and 0.01 mT becoming constant only above this field. This implies that the apparent potentials that control wall motion are not harmonic but superhamonic for small displacements which contradicts recent domain wall resonance measurements. The discrepancy is apparently caused by interactions between individual grains in the samples studied by domain wall resonance.
Banerjee Subir K.
Smith Guy M.
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