Abstract

We have measured the perpendicular magnetomechanical coupling, perpendicular susceptibility and shear modulus in polycrystalline Tb <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">.27</inf> Dy <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">.73</inf> Fe <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> by measuring the self-impedance of a cylinder (Wiedemann effect). We find: (1) the maximum value of the perpendicular coupling factor to be greater than .7, considerably higher than the parallel value of .55; (2) the perpendicular susceptibility to be greater than the parallel susceptibility except at zero field where they are equal; (3) a considerably softened shear modulus; (4) an anomalous increase in the skin depth in a narrow range of frequencies above resonance. We present a theory which describes the magnetoelastic behavior and the anomalous skin effect.

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