Abstract:We theoretically address the problem of cubic B20 helimagnets with small concentration c 1 of defect bonds in external magnetic field H, which is relevant to mixed B20 compounds at small dopant concentrations. We assume that Dzyaloshinskii-Moriya interaction and the exchange coupling constant are changed on imperfect bonds which leads to distortion of the conical spiral ordering. In one-impurity problem, we find that the distortion of the spiral pitch is long-ranged and it is governed by the Poisson equation f… Show more
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