Internal friction in gadolinium

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Abstract
The low-temperature internal friction spectrum of gadolinium consists of two peaks, labelled α and β. The former is independent and the latter dependent on, the strain amplitude. Domain wall motion, induced by the applied stress, is responsible for both peaks, which are not caused by a relaxation mechanism. The microeddy currents generated by changes in magnetization are responsible for the α peak and from an analysis of the theory, a domain size of 10−3 cm is deduced. The β peak is caused by the temperature variation of the magnetostriction constant and is essentially a hysteresis loss.

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