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Using an effective Hamiltonian of mutiferroic BiFeO3 (BFO) as a toy model, we explore the effect of the coefficient, C, characterizing the strength of the spin-current interaction, on physical properties. We observe that for larger C values and below a critical temperature, the magnetic moments organize themselves in a novel cycloid, which propagates along a low-symmetry direction and is associated with a structural phase transition from polar rhombohedral to a polar triclinic state. We emphasize that both of these magnetic and structural transitions are results of a remarkable self-organization of different solutions of the spin-current model. © 2013 Materials Research Society .

Novel magnetic arrangement and structural phase transition induced by spin–lattice coupling in multiferroics