Abstract
THE intensity of isothermal remanent magnetization of a ferromagnetic body usually increases with its cooling in non-magnetic space, owing to increase in spontaneous magnetization. We have found, however, that the direction of isothermal remanent magnetization of a single crystal of magnetite produced at room temperature is reversed at about −143° C in a cooling process in non-magnetic space. The sample examined by us was a single crystal of magnetite collected from Mituisi, Japan. The chemical composition (less than 0.3 per cent titanium dioxide content) and the X-ray data (a = 8.391 Å) of this sample indicate that it is nearly stoichiometric magnetite.
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References
Nagata, T., Ozima, M., and Yama-ai, M., Nature, 197, 444 (1963).
Uyeda, S., Jap. J. Geophys., 2, 1 (1958).
Ozima, M., Yama-ai, M., and Nagata, T., Geofisica Pura e Applicata (in the press).
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YAMA-AI, M., OZIMA, M. & NAGATA, T. Self-reversal of Remanent Magnetization of Magnetite at Low Temperatures. Nature 198, 1188–1189 (1963). https://doi.org/10.1038/1981188b0
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DOI: https://doi.org/10.1038/1981188b0
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