title: Coupled magnetic cycloids in multiferroic TbMnO3 and Eu3/4Y1/4MnO3.
abstract: Based on the detailed Mn L(2,3)-edge x-ray resonant scattering results, we report a new complexity in the magnetic order of multiferroic orthomangnites, which has been considered as the simple A-type cycloid order inducing ferroelectricity. The Dzyaloshinskii-Moriya interaction involved in the orthorhombic distortion brings on F-type canting from the A type, and the ordering type becomes the off-phase synchronized bc cycloid in TbMnO(3) or the tilted antiphase ab cycloid in Eu(3/4)Y(1/4)MnO(3). The F-type canting is responsible for the magnetic field-driven multiferroicity to weak ferromagnetism transition.
authors.affiliation: Department of Physics, Pohang University of Science and Technology, Pohang, Korea.
authors.forename: Hoyoung
authors.initials: H
authors.lastname: Jang
authors.forename: J-S
authors.initials: JS
authors.lastname: Lee
authors.forename: K-T
authors.initials: KT
authors.lastname: Ko
authors.forename: W-S
authors.initials: WS
authors.lastname: Noh
authors.forename: T Y
authors.initials: TY
authors.lastname: Koo
authors.forename: J-Y
authors.initials: JY
authors.lastname: Kim
authors.forename: K-B
authors.initials: KB
authors.lastname: Lee
authors.forename: J-H
authors.initials: JH
authors.lastname: Park
authors.forename: C L
authors.initials: CL
authors.lastname: Zhang
authors.forename: Sung Baek
authors.initials: SB
authors.lastname: Kim
authors.forename: S-W
authors.initials: SW
authors.lastname: Cheong