EXPERIMENTAL-STUDY OF BULK-WAVE ELECTROMAGNETIC - ACOUSTIC TRANSDUCTION IN FERRITES

Reciprocal (direct + inverse) electromagnetic-acoustic transduction in ferrites of the spinel class is investigated experimentally and compa red with the case of electrically conducting magnets. It is shown that surface forces play a decisive role in ferrites. In the temperature r ange from T-room to the Curie point T-c the generation of both longitu dinal and transverse ultrasound is instigated exclusively by anisotrop ic magnetostriction. A qualitative interpretation is given for the tem perature dependences of the electromagnetic-acoustic transduction para meters in ferrites.