Magnetic Phase Diagram of the Giant Magnetoelectric, DyMn2O5

It has been recently found that DyMn$_{2}$O$_{5}$ 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 this 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.