A phenomenological analysis of the experimental phase states of the DyMnO3 ferroelectromagnet with a modulated spin structure in magnetic fields along the X, Y, and Z axes was carried out, taking into account the fourth-order magnetic anisotropy. The possibility of a polarization flop (i.e., reorientation of the direction of electric polarization) is explained only in cases of a magnetic field direction along the X and Y axes. The relative values of the fourth-order magnetic anisotropy parameters consistent with measurements of magnetic moments are found.

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