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The results of investigation of volumetric magnetostriction of a ferromagnetic composite consisting of silicon steel particles dispersed in an elastomer matrix and its relaxation are presented. The composite consisted of silicon steel particles of 0.15–0.20 mm in size, which were dispersed in a polymerized silicone. The filling factor of the composite by these particles amounted to 0.4, 0.6 or 0.8. The investigation was carried out by means of the pycnometric method in a magnetic field with the induction of 0–8 T produced by Bitter's magnet. It was found that according to the filling factor and the induction of the applied magnetic field, relative changes in the sample volume amounted to (0.37–112.8) × 10-4 and the relaxation time of the volumetric magnetostriction was 2.12–85.8 s.

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