Abstract
Continuous spectra of resonances are observed when some ferromagnetic substances are examined with cw or spin-echo rf spectrometers. These resonances have previously been assigned to domain-wall motion; evidence is presented here to show rather that they are magnetically excited acoustic vibrations. An explanation of the manner in which a nonlinear magnetoacoustic interaction allows the production of echoes in an otherwise linear system is presented. A means of suppressing these resonances to facilitate the study of nuclear magnetic resonances in magnetic materials is demonstrated.
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