Coexistence and Coupling between Dielectric Order and Magnetic Order in Multiferroic Material of RMn₂O₅ (R=rare-earth, Bi, Y)

Abstract

Microscopic magnetism and dielectric properties in the multiferroic rare-earth manganites of RMn₂O₅ studied by neutron diffraction and dielectric measurements are reviewed.It has been revealed that RMn₂O₅ shows successive dielectric and magnetic phase transitions, which concomitantly take place and are induced by temperature, magnetic field, and hydrostatic pressure.This coexistence and mutual coupling between dielectric and magnetic order, as well as the induced 4f magnetic moment on rare-earth ions, are ingredients essential for realizing a rich variety of colossal magnetoelectric effect.