Origin of the large polarization in multiferroic YMnO3 thin films revealed by soft- and hard-X-ray diffraction |
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| Authors: | Wadati H Okamoto J Garganourakis M Scagnoli V Staub U Yamasaki Y Nakao H Murakami Y Mochizuki M Nakamura M Kawasaki M Tokura Y |
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| 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 |
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| 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. |
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