Speaker
Description
Manganite oxides family RMn2O5 (R – rare-earth element) represents prominent example of a multiferroics with extremely interesting and close relationship between magnetism and ferroelectricity. The understanding of the microscopic mechanisms responsible for spin-driven ferroelectricity in these compounds considered to be the actual and intriguing issue in the studies of multiferroicity of magnetic origin. In order to make a new approach to clarifying those mechanisms we performed the detailed investigations of the magnetic ordering in single crystals of multiferroics Nd1-xTbxMn2O5 (x = 0, 0.2, 1) using both non-polarized and polarized neutron diffraction techniques.
We show that in all the crystals the chiral scattering originated from the difference between the population of right- and left-handedness chiral domains was observed. This difference can be controlled by the external electric field of few kV/cm revealing strong magnetoelectric coupling. The results are considered within the frames of antisymmetric super-exchange model for Dzyaloshinsky-Moria interaction.
