Abstract
SUMMARY We report results of a collaborative investigation of the experimental properties of chemical remanent magnetization (CRM) acquired when nearly single-domain size magnetite undergoes low-temperature oxidation to maghemite and of viscous remanent magnetization (VRM) acquired by the daughter phase maghemite. Magnetite grains 100-200 nm in diameter were oxidized for varying lengths of time at a temperature of 220 C. The acquisition of CRM in fields of 0.2,0.5 and 1 Oe was monitored at frequent intervals during heating runs lasting 30 hr. Zero-field decay of this remanence was then monitored for periods of 160-430 hr. Subsequently VRM acquisition and decay were measured for similar time periods for the daughter phase maghemite (z = 0.96). The principal results are as follows.
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