title: Antiferromagnetically spin polarized oxygen observed in magnetoelectric TbMn2O5.
abstract: We report the direct measurement of antiferromagnetic spin polarization at the oxygen sites in the multiferroic TbMn2O5, through resonant soft x-ray magnetic scattering. This supports recent theoretical models suggesting that the oxygen spin polarization is key to the magnetoelectric coupling mechanism. The spin polarization is observed through a resonantly enhanced diffraction signal at the oxygen K edge at the commensurate antiferromagnetic wave vector. Using the fdmnes code we have accurately reproduced the experimental data. We have established that the resonance arises through the spin polarization on the oxygen sites hybridized with the square based pyramid Mn3+ ions. Furthermore we have discovered that the position of the Mn3+ ion directly influences the oxygen spin polarization.
authors.affiliation: Department of Physics, University of Durham, Rochester Building, South Road, Durham DH1 3LE, United Kingdom.
authors.forename: T A W
authors.initials: TA
authors.lastname: Beale
authors.forename: S B
authors.initials: SB
authors.lastname: Wilkins
authors.forename: R D
authors.initials: RD
authors.lastname: Johnson
authors.forename: S R
authors.initials: SR
authors.lastname: Bland
authors.forename: Y
authors.initials: Y
authors.lastname: Joly
authors.forename: T R
authors.initials: TR
authors.lastname: Forrest
authors.forename: D F
authors.initials: DF
authors.lastname: McMorrow
authors.forename: F
authors.initials: F
authors.lastname: Yakhou
authors.forename: D
authors.initials: D
authors.lastname: Prabhakaran
authors.forename: A T
authors.initials: AT
authors.lastname: Boothroyd
authors.forename: P D
authors.initials: PD
authors.lastname: Hatton