A remarkable account of the micro-measurement of single haematite grains provides data that are to late to provide reassurance for palaeomagnetism, but no doubt help tape manufacturers to better things.
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Maddox, J. Measuring magnets on a micron scale. Nature 371, 739 (1994). https://doi.org/10.1038/371739a0
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DOI: https://doi.org/10.1038/371739a0