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Antiferromagnetically Spin Polarized Oxygen Observed in Magnetoelectric TbMn2O5

Beale, TAW; Wilkins, SB; Johnson, RD; Bland, SR; Joly, Y; Forrest, TR; McMorrow, DF; ... Hatton, PD; + view all (2010) Antiferromagnetically Spin Polarized Oxygen Observed in Magnetoelectric TbMn2O5. PHYS REV LETT , 105 (8) , Article 087203. 10.1103/PhysRevLett.105.087203. Green open access

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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.

Type: Article
Title: Antiferromagnetically Spin Polarized Oxygen Observed in Magnetoelectric TbMn2O5
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.105.087203
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.105.087203
Language: English
Additional information: © 2010 The American Physical Society
Keywords: NEUTRON-DIFFRACTION, SCATTERING
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/130222
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