Journal
GEOPHYSICAL JOURNAL INTERNATIONAL
Volume 140, Issue 1, Pages 101-114Publisher
OXFORD UNIV PRESS
DOI: 10.1046/j.1365-246x.2000.00999.x
Keywords
low-temperature properties; magnetite; rock magnetism
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The low-temperature magnetic properties of magnetite are reviewed, and implications for rock magnetism considered. The behaviour of fundamental properties of magnetite at low temperatures near the Verwey transition (T-v) are documented, and attention is given to various Verwey transition theories. The low-temperature behaviour of the magnetic energies that control domain structure is reviewed in detail. For the first time in rock magnetic literature, the low-temperature anomaly in spontaneous magnetization (M-s) is documented and the differences between the saturation magnetization and M-s near the Verwey transition are discussed. It is argued that the low-temperature behaviour of the magnetocrystalline anisotropy, and in particular the anomaly at T-v, is most likely to affect multidomain remanence during low-temperature cycling. For multidomain crystals it is calculated that the large increase in magnetocrystalline anisotropy intensity and reduction in symmetry on cooling through T-v is likely to reduce the stability of closure domains.
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