It was pointed out that the rich order-parameter of spin density waves allowed for the existence of unusual objects having a complex topological nature. Such so-called chimerae consisted of a half-integer dislocation, combined with a semi-vortex of staggered magnetization. They became energetically favourable due to enhanced Coulomb interactions, and their generation changed the narrow band noise frequency.

Combined Topological Defects in Spin Density Waves and Narrow Band Noise Generation. N.Kirova, S.Brazovskii: Synthetic Metals, 1999, 103[1-3], 1831-2