The variation of internal friction with strain amplitude at temperatures of 115, 168, 215, 245 and 298°K has been measured using a torsional pendulum at a frequency of 1 c/s. The damping with a magnetic origin has been separated from the total damping by a method due to Granato and Lücke, and the results have been explained in terms of the irreversible movement of 90° domain boundaries. A simple analysis using domain theory predicts a relation between the stress at peak damping and the magnetic field at maximum susceptibility. For gadolinium this field is 0·06 Oe at 245°K. A simple treatment of the variation of peak damping with temperature shows qualitative agreement with the results.
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Burdett et al. (1967) studied this question.
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