Abstract
Data on the damping of ultrasonic waves in the vicinity of the point of inversion of the first anisotropy constant are reported for manganese-zinc spinel crystals grown by various methods. A low-frequency maximum in the ultrasonic wave damping caused by the magnetoelastic interaction in the region of a magnetic phase transition in the spinel is observed for the first time. A difference in the acoustic properties of crystals of various types observed in the region of the phase transition is explained by the difference of internal fields related to differences in the degree of macroscopic disorder and in the arrangement of Fe2+ and Fe3+ ions in the spinel crystal lattice.
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