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We have carried out 63,65Cu NMR spectra measurements in magnetic field up toabout 15.5 T on single crystal of a multiferroic triangular-latticeantiferromagnet CuCrO2. The measurements were performed for perpendicular andparallel orientation of the magnetic field with respect to the c-axis of thecrystal, and the detailed angle dependence of the spectra on the magnetic fielddirection within ab-plane was studied. The shape of the spectra can be welldescribed in the model of spiral spin structure proposed by recent neutrondiffraction experiments. When field is rotated perpendicular to crystal c-axis,we observed, directly for the first time, a remarkable reorientation of spinplane simultaneous with rotation of the incommensurate wavevector byquantitatively deducing the conversion of less energetically favorable domainto a more favorable one. At high enough fields parallel to c-axis, the data areconsistent with either a field-induced commensurate spiral magnetic structureor an incommensurate spiral magnetic structure with a disorder in the cdirection, suggesting that high fields may have influence on interplanarordering.

Magnetic structure and domain conversion of quasi-2D frustrated antiferromagnet CuCrO2 probed by NMR