We report the first successful conversion of z-directed spin waves to longitudinal elastic waves (and vice versa) in an axially magnetized (z axis) single-crystal YIG rod. The conversions — carried out at L-band frequencies and room temperature — were possible because the symmetry axis of the rod was not along a principal crystallographic direction; the axis was chosen to be in a {100} plane at an angle of 22.5° with respect to a <100> direction in order to provide nearly maximum spin-longitudinal elastic wave coupling.
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Morgenthaler et al. (1970) studied this question.
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