Abstract
Ultrasonic attenuation and dispersion are studied in polycrystalline MnZn ferrites. Both factors are strongly influenced by the coupling of sound waves to the spin system. This coupling is governed by the λ 111 magnetostriction constant only, and not by λ 100. A simple model can account for all the observed results in a quantitative fashion. Using this model, values of λ 111 can be determined from acoustic and susceptibility measurements which show good agreement with λ 111 data from the literature on static torque measurements of single crystals.
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