Physics
Scientific paper
Sep 1971
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1971pepi....4..353s&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 4, Issue 5, p. 353-360.
Physics
29
Scientific paper
An extension of Néel's single domain theory to distributions of single domain grains is given. The method of deducing the form of the distribution involves the measurement of the temperature dependence of initial susceptibility and of the thermal demagnetization curves of isothermal and thermoremanent magnetizations between 77 and 300-400 °K. In addition it is shown that whatever the shape of the distribution, the slope of the acquisition of isothermal remanence can be related to the initial slopes of the variation of isothermal remanence with time and temperature, the thermoremanence with temperature, and the viscous remanence with time. The theory applies to any single domain grain distribution for which the spontaneous magnetization and the coercive force in the absence of thermal fluctuations can be regarded as constant over the above temperature range.
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