Strong enhancement of magnetoelectric coupling in Dy 3+ doped HoMnO 3

International audienceThe magnetoelectric effect in Ho0.9Dy0.1MnO3 is found 31 times stronger than HoMnO3 which could be due to strong lattice frustration arises out of the structural distortion on doping. The TN observed from magnetic measurement reveals a double peak corresponding to the in-plane and inter-planar ordering leading to assignment of Γ4 structure. The antiferromagnetic transition at TN indeed drives dielectric transition mediated by the lattice strain whereas at the TSR, lattice strain drives the spin reorientation of Mn3+. In contrary to the long held belief, the magnetic structure changes from Γ4 to Γ1 at TSR instead of Γ4 to Γ3