Physics
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pepi...41..283h&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 41, Issue 4, p. 283-291.
Physics
11
Scientific paper
The magnetic poles on a multidomain grain with a magnetization J produce a field NJ tending to demagnetize the grain, strongly affecting many magnetic properties of rocks bearing multidomain magnetite. The average self-demagnetizing factor N of multidomain grains in a rock is thus an important parameter which is shown to be simply measured from a high-field hysteresis loop using HC/JR <= N <= HC/JR - HC/JRi (where HC is the coercive force, JR the saturation remanence and JRi an estimate of JR when N = 0). Measuring magnetic susceptibility x and coercive force HC as a function of low temperature and then plotting 1/x versus HC/JS (where JS is saturation magnetization) gives a straight line whose intercept on the 1/x-axis also estimates N. These two independent estimates of N are shown to agree for the seven magnetite-bearing basaltic rocks studied (yielding an average N = 1.7 e.m.u.) and for the 0.2 mm natural magnetite grains (yielding N = 2.6 +/- 0.2 e.m.u.). In contrast, estimating N from HC/JR - 1/xi (where xi is x when N = 0) is shown to be invalid and even use of N = 1/x - HC/45 is not recommended. Measured N is much below the ~ 4 e.m.u. expected of large equidimensional magnetite grains which is understandable for the rocks of higher coercive force but makes further study of rocks of low coercive force desirable.
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