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Science 7 April 1972:
Vol. 176. no. 4030, pp. 41 - 43
DOI: 10.1126/science.176.4030.41
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Articles

Magnetite: Behavior near the Single-Domain Threshold

D. J. Dunlop 1

1 Geophysics Laboratory, University of Toronto, Toronto 5, Ontario, Canada

Maximum values for the single-domain threshold d0 and superpara-magnetic threshold d8 in pure magnetite are found to be 570±50 and 350±50 angstroms, respectively. Particles larger than do but smaller than about 0.25 micron have size-dependent saturation remanences and coercive forces like those of multidomain particles, but intense and stable thermoremanent magnetization like that of single-domain particles. The presence of magnetite grains in this size range could account for the essentially single-domain character of stable natural remanence in many volcanic and intrusive rocks.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)