Magnetochiral effect (MChE) of phonons, a nonreciprocal acoustic property arising due to the symmetry principles, is demonstrated in a chiral-lattice ferrimagnet Cu2OSeO3. Our high-resolution ultrasound experiments reveal that the sound velocity differs for parallel and antiparallel propagation with respect to the external magnetic field. The sign of the nonreciprocity depends on the chirality of the crystal in accordance with the selection rule of the MChE. The nonreciprocity is enhanced below the magnetic ordering temperature and at higher ultrasound frequencies, which is quantitatively explained by a proposed magnon-phonon hybridization mechanism.
The structure, magnetic and magneto-optical properties of the MnBiRe (Re = Ce and Nd) thin mms are discussed. It has been found for those mms that the magnetization is in the range from 20 to 50 emuig, Hc = 1 -4 kOe. The dependence of the Kerr rotation angle ~and reflectivity R on the wave-length (400-900 nm) was measured at room temperature.•lne 8~ was in the range from 1 to 2.5 . and R = 0.3 to 0.45. X -ray diffraction shows that" the' crystal to be mainly MnBi hcp and similar for MnBiNd films.
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