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Science 10 November 1967:
Vol. 158. no. 3802, pp. 785 - 787
DOI: 10.1126/science.158.3802.785
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Articles

Stable Magnetic Remanence in Antiferromagnetic Goethite

D. W. Strangway 1, B. E. McMahon 1, and R. M. Honea 2

1 Department of Geology and Geophysics, Massachusetts Institute of Technology, Cambridge 02139
2 Department of Geological Sciences, University of Colorado, Boulder

Goethite, known to be antiferromagnetic, acquires thermoremanent magnetization at its Neel temperature of 120°C. This remanence, extremely stable, is due to the presence of unbalanced spins in the antiferromagnetic structure; the spins may result from grain size, imperfections, or impurities.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)