Origin of the magnetomechanical effect in an alternating field

The paper describes further experiments on the internal friction of nickel in an alternating magnetic field. It was found that the effect is not caused by macroscopic eddy currents but by microscopic eddy currents connected with changes in domain structure, which macroscopically have a reversible character and which appear both in the region of wall displacements and in the region of the rotation of magnetization vectors. The anelastic character of the effect is confirmed by measuring the dependence of the effect on the frequency of the field and on torsional oscillations; the relaxation time of the effect is determined by the circular frequency of the alternating magnetic field. The different aspects of the effect are discussed and a possible way of calculation is indicated.

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The autor wishes to express his gratitude to Dr. Wotruba, Dr. L. paek and others for valuable discussions.