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Title: Origin of magnetoelectric coupling effect and spin dynamics of multiferroic system Co4Nb2O9
Authors: Deng, G
Cao, Y
Ren, W
Cao, S
Studer, AJ
Gauthier, N
Kenzelmann, M
Davison, G
Rule, KC
Gardner, JS
Imperia, P
Ulrich, C
McIntyre, GJ
Keywords: Electrical properties
Magnetic fields
Crystal structure
Magnetic moments
Phase transformations
Neutron diffraction
Issue Date: 12-Jul-2017
Publisher: International Conference on Neutron Scattering
Citation: Deng, G., Cao, Y., Ren, W., Cao, S., Studer, A., Gauthier, N., Kenzelmann, M., Davison, G., Rule, K., Gardner, J. Imperia, P., Ulrich, C., & McIntyre, G. (2017). Origin of magnetoelectric coupling effect and spin dynamics of multiferroic system Co4Nb2O9. Paper presented at ICNS 2017 (International Conference on Neutron Scattering), Daejeon, South Korea, 9 to 13 July 2017. Retrieved from:
Abstract: Co4Nb2O9,was recently reported to have large magnetoelectric coupling effect under a certain magnetic field.[1,2] This compound has a crystal structure (space group P-3c1) derived from corundum structure and undergoes antiferromagnetic phase transition around 27K. It was previously believed that the magnetic moments of Co2+ order into a collinear antiferromagnetic structure in which magnetic moments are parallel to the c axis and form ferromagnetic chains with antiparallel inter-chain coupling.[3] However, the recent study has shown that this magnetic structure model is incorrect.[4] In this study, we found that the Co2+magnetic moments on both Co1 and Co2 sites align in the ab plane with a non-collinear configuration. Using inelastic neutron scattering, we measured the spin wave excitation from its magnetic phase along (h00) and (00l). A spin dynamic model proposed in this study is able to explain the observed spin dynamical behavior quite well. The nearest and next nearest neighbor interactions (NN and NNN) along the c axis are ferromagnetic. The interaction on the zig-zag ring of Co1 perpendicular to the c axis is highly frustrated while that of the zig-zag ring of Co2 is antiferromagnetic. The single ion anisotropy and Dzyaloshinskii-Moriya (DM) interaction contribute to the spin dynamics of Co4Nb2O9 as well. The simulated spin wave excitation by using SpinW[5] matches the experimental data very well. The DM interaction, which is most probably due to the triangle Co2-O-Co2 bond, was found to be the origin of the magnetoelectric coupling in this compound.
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