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Diffraction of light at 1.15 μ has been observed from magnetoelastic waves at 1.1 GHz in YIG. A shift in the Bragg diffraction angle was observed when an external magnetic field was varied so as to change the spin wave admixture. The largest shift obtained experimentally was -2.0°, measured from the elastic limit of 9.5°. This shift was accompanied by a delay in the diffracted pulse of about 1 μsec. Under quasielastic conditions the diffracted intensity exhibited a series of maxima as the field was swept, due to magnetoelastic Faraday rotation.
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Archibald W. Smith (1967) studied this question.
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