Abstract
Measurements of the attenuation coefficient of longitudinal ultrasonic waves have been made on a single crystal of chromium near the spin-flip order-order transition. Measurements were made for sound propagation along a $〈100〉$ axis with the crystal in the normal state and after magnetic field cooling through the N\'eel point in two different geometries. Considerable differences in behavior were found between the different magnetic geometries and also upon applying a large magnetic field near the spin-flip temperature. A mechanism involving switching of the polarization of the spin density waves at domain boundaries is proposed to account for the results. The relaxation time associated with this switching is estimated to be ${10}^{\ensuremath{-}10}$ sec.
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