Abstract
Experimental results for magnetostrictive generation of low-frequency standing elastic waves in polycrystalline and amorphous ferromagnetic materials are given. By exciting magnetized samples with bursts of magnetic impulses, extensional and torsional modes of damped wave propagation were observed. These propagation patterns are qualitatively explained by means of the theory of linear magnetoacoustic coupling taking into account the residual stresses alone. A comparison of the magnetomechanical behavior of the materials investigated has been made by studying the conditions of reversible magnetostriction and the magnetic damping. In particular, in the Ni rod, it was possible to clarify the log decrement behavior on the basis of the reversible magnetomechanical permeability and the ΔE effect measured.
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