Antiferromagnetically spin polarized oxygen observed in magneto-electric 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 wavevector. 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.

5 pages, 4 figures

References in corpus (7)

• Spin current and magneto-electric effect in non-collinear magnets
• First-principles study of the lattice and electronic structures of TbMn${}_2$O${}_5$
• Non-resonant and Resonant X-ray Scattering Studies on Multiferroic TbMn2O5
• Microscopic mechanisms of spin-dependent electric polarization in 3d oxides
• An x-ray resonant diffraction study of multiferroic DyMn2O5
• Induced ferroelectric phases in TbMn_2O_5
• Determination of magnetic order of the rare-earth ions in multiferroic TbMn2O5

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• Dzyaloshinsky-Moriya driven helical-butterfly structure in Ba3NbFe3Si2O14
• Evidence for ordered magnetic moments at oxygen sites in antiferromagnetic Sr${}_2$IrO${}_4$ and Sr${}_3$Ir${}_2$O${}_7$
• Independent ferroelectric contributions and rare-earth-induced polarization reversal in multiferroic TbMn2O5
• Crystal Symmetry Lowering in Chiral Multiferroic Ba${}_3$TaFe${}_3$Si${}_2$O${}_{14}$ observed by X-Ray Magnetic Scattering
• Magnetically induced electric polarization reversal in multiferroic TbMn${}_2$O${}_5$: Terbium spin reorientation studied by resonant x-ray diffraction
• Long range antiferromagnetic order of formally non-magnetic Eu${}^{3+}$ Van Vleck ions observed in multiferroic Eu${}_{1-x}$Y${}_x$MnO${}_3$
• Direct control of magnetic chirality in NdMn2O5 by external electric field
• Electronic charge transfer driven by spin cycloidal structure
• Collective Phase-like Mode and the Role of Lattice Distortions at TN~TC in RMn2O5 (R= Pr, Sm, Gd, Tb, Bi)