Magnetic Phase Diagram of the Giant Magnetoelectric DyMn2O5

William Ratcliff II, NCNR

It has been recently found that DyMn2O5 develops a spontaneous electric polarization below the Neel ordering temperature. Furthermore, this spontaneous polarization can be switched through the application of a magnetic field. Several anomalies were also observed in the dielectric constant. We have performed neutron diffraction measurements on a single crystal of such a material, and have found that anomalies in the dielectric constant and the polarization are correlated with magnetic transitions induced by field or temperature. During this talk, I will present the magnetic phase diagram of this system and show how it corresponds to the spontaneous polarization and anomalies in the dielectric constant.

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