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X-ray resonant magnetic scattering studies of rare earth magnetic orderingwere performed on perovskite manganites RMnO3 (R = Dy, Gd) in an appliedmagnetic field. The data reveal that the field-induced three-fold polarizationenhancement for H || a (H approx. 20 kOe) observed in DyMnO3 below 6.5 K is dueto a re-emergence of the Mn-induced Dy spin order with propagation vector k(Dy)= k(Mn) = 0.385 b*, which accompanies the suppression of the independent Dymagnetic ordering, k(Dy) = 1/2 b*. For GdMnO3, the Mn-induced ordering of Gdspins is used to track the Mn-ordering propagation vector. The data confirm theincommensurate ordering reported previously, with k(Mn) varying from 0.245 to0.16 b* on cooling from T_N(Mn) down to a transition temperature T'. Newsuperstructure reflections which appear below T' suggest a propagation vectork(Mn) = 1/4 b* in zero magnetic field, which may coexist with the previouslyreported A-type ordering of Mn. The Gd spins order with the same propagationvector below 7 K. Within the ordered state of Gd at T = 1.8 K we find a phaseboundary for an applied magnetic field H || b, H = 10 kOe, which coincides withthe previously reported transition between the ground state paraelectric andthe ferroelectric phase of GdMnO3. Our results suggest that the magneticordering of Gd in magnetic field may stabilize a cycloidal ordering of Mn that,in turn, produces ferroelectricity.

Magnetic-field induced effects on the electric polarization in RMnO3 (R = Dy, Gd)