title: Giant tunability of ferroelectric polarization in GdMn2O5.
abstract: Giant tunability of ferroelectric polarization (ΔP=5000  μC/m2) in the multiferroic GdMn2O5 with external magnetic fields is discovered. The detailed magnetic model from x-ray magnetic scattering results indicates that the Gd-Mn symmetric exchange striction plays a major role in the tunable ferroelectricity of GdMn2O5, which is in distinction from other compounds of the same family. Thus, the highly isotropic nature of Gd spins plays a key role in the giant magnetoelectric coupling in GdMn2O5. This finding provides a new handle in achieving enhanced magnetoelectric functionality.
authors.affiliation: Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA.
authors.forename: N
authors.initials: N
authors.lastname: Lee
authors.forename: C
authors.initials: C
authors.lastname: Vecchini
authors.forename: Y J
authors.initials: YJ
authors.lastname: Choi
authors.forename: L C
authors.initials: LC
authors.lastname: Chapon
authors.forename: A
authors.initials: A
authors.lastname: Bombardi
authors.forename: P G
authors.initials: PG
authors.lastname: Radaelli
authors.forename: S-W
authors.initials: SW
authors.lastname: Cheong