Abstract
Studies on two rare cases of magnetic behaviour in basaltic rocks are reported. In both the cases a peak in susceptibility occurs at −160°C. However, one sample shows only normal hysteresis loops at low temperatures in a wide range of fields, while the other sample shows a constricted hysteresis loop in 1000 Oe at −190°C. Both types of behaviour can occur as a result of differing states of aggregation of interacting superparamagnetic particles in the respective samples.
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Radhakrishnamurty, C., Sastry, N.P. & Deutsch, E.R. Ferromagnetic behaviour of interacting superparamagnetic particle aggregates in basaltic rocks. Pramana - J. Phys. 1, 61–65 (1973). https://doi.org/10.1007/BF02847178
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DOI: https://doi.org/10.1007/BF02847178