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Quartic asymmetric exchange for two-dimensional ferromagnets with trigonal prismatic symmetry
We suggest a possible origin of noncollinear magnetic textures in ferromagnets (FMs) with the ${D}_{3h}$ point group symmetry. The suggested mechanism is different from the Dzyaloshinskii-Moriya interaction (DMI) and its straightforward generalizations. The considered symmetry class is important because a large fraction of all single-layer intrinsic FMs should belong to …