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Ferromagnetism; superparamagnetism; basaltic rocks

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.

C Radhakrishnamurty¹ N P Sastry¹ E R Deutsch²

1. Tata Institute of Fundamental Research, Bombay - 400005
2. Physics Department, Memorial University of Newfoundland, St. John’s, Canada

Published

August 1973

Manuscript received

7 January 1973