Resonant coupling of shear waves in magnetostrictive rare-earth-iron compounds

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Abstract
The possibility of altering the direction of polarization of [110] shear waves in cubic ferromagnets is discussed. Using conventional magnetoelastic theory and known elastic and magnetoelastic parameters it is predicted that in Tb0.3Dy0.7Fe2 it is possible, by rotating an applied magnetic field in the (110) plane, to change the polarization of an incident wave by 90°. The acoustical amplitude in a receiving transducer whose axis was perpendicular to that of the transmitting one was measured in fields from 4 to 10 kOe. The amplitude as a function of orientation is sharply peaked at the angle of field at which a rapid change in normal-mode polarization is predicted.