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Antiferromagnetically spin polarized oxygen observed in magnetoelectric TbMn2O5.

Beale, T.A.W. and Wilkins, S.B. and Johnson, R.D. and Bland, S.R. and Joly, Y. and Forrest, T.R. and McMorrow, D.F. and Yakhou, F. and Prabhakaran, D. and Boothroyd, A.T. and Hatton, P.D. (2010) 'Antiferromagnetically spin polarized oxygen observed in magnetoelectric TbMn2O5.', Physical review letters., 105 (8). 087203.


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.

Item Type:Article
Keywords:Neutron-diffraction, Scattering.
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Publisher statement:© 2010 American Physical Society
Record Created:28 Nov 2012 09:35
Last Modified:28 Nov 2012 10:58

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