title: Origin of the large polarization in multiferroic YMnO3 thin films revealed by soft- and hard-X-ray diffraction.
abstract: We investigated the magnetic structure of an orthorhombic YMnO(3) thin film by resonant soft x-ray and hard x-ray diffraction. We observed a temperature-dependent incommensurate magnetic reflection below 45 K and a commensurate lattice-distortion reflection below 35 K. These results demonstrate that the ground state is composed of coexisting E-type and cycloidal states. Their different ordering temperatures clarify the origin of the large polarization to be caused by the E-type antiferromagnetic states in the orthorhombic YMnO(3) thin film.
authors.affiliation: Department of Applied Physics and Quantum-Phase Electronics Center, University of Tokyo, Hongo, Tokyo 113-8656, Japan. wadati@ap.t.u-tokyo.ac.jp
authors.forename: H
authors.initials: H
authors.lastname: Wadati
authors.forename: J
authors.initials: J
authors.lastname: Okamoto
authors.forename: M
authors.initials: M
authors.lastname: Garganourakis
authors.forename: V
authors.initials: V
authors.lastname: Scagnoli
authors.forename: U
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authors.lastname: Staub
authors.forename: Y
authors.initials: Y
authors.lastname: Yamasaki
authors.forename: H
authors.initials: H
authors.lastname: Nakao
authors.forename: Y
authors.initials: Y
authors.lastname: Murakami
authors.forename: M
authors.initials: M
authors.lastname: Mochizuki
authors.forename: M
authors.initials: M
authors.lastname: Nakamura
authors.forename: M
authors.initials: M
authors.lastname: Kawasaki
authors.forename: Y
authors.initials: Y
authors.lastname: Tokura