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An estimate is made of the effect of externally applied stress upon the remanent magnetic moment of an assembly of multi-domain magnetite grains. Magnetite is highly magnetostrictive and therefore very sensitive to stress, and it is estimated that remanent moments are changed by about 0.05 per cent per atmosphere of applied linear compression. Moments parallel to the direction of compression are reduced and those perpendicular to it are increased; moments with intermediate orientations are deflected away from the direction of compression.
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Frank D. Stacey (1958) studied this question.
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