Origin of magnetoelectric coupling effect and spin dynamics of multiferroic system Co4Nb2O9

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dc.contributor.authorDeng, GCen_AU
dc.contributor.authorCao, YMen_AU
dc.contributor.authorRen, Wen_AU
dc.contributor.authorCao, SXen_AU
dc.contributor.authorStuder, AJen_AU
dc.contributor.authorGauthier, Nen_AU
dc.contributor.authorKenzelmann, Men_AU
dc.contributor.authorDavison, Gen_AU
dc.contributor.authorRule, KCen_AU
dc.contributor.authorGardner, JSen_AU
dc.contributor.authorImperia, Pen_AU
dc.contributor.authorUlrich, Cen_AU
dc.contributor.authorMcIntyre, GJen_AU
dc.date.accessioned2021-08-11T04:41:43Zen_AU
dc.date.available2021-08-11T04:41:43Zen_AU
dc.date.issued2017-07-12en_AU
dc.date.statistics2021-08-10en_AU
dc.description.abstractCo4Nb2O9,was recently reported to have large magnetoelectric coupling effect under a certain magnetic field. 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. However, the recent study has shown that this magnetic structure model is incorrect. 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.en_AU
dc.identifier.citationDeng, 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: http://www.icns2017.org/program.phpen_AU
dc.identifier.conferenceenddate13 July 2017en_AU
dc.identifier.conferencenameICNS 2017 (International Conference on Neutron Scattering)en_AU
dc.identifier.conferenceplaceDaejeon, South Koreaen_AU
dc.identifier.conferencestartdate9 July 2017en_AU
dc.identifier.urihttp://www.icns2017.org/program.phpen_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/11320en_AU
dc.language.isoenen_AU
dc.publisherInternational Conference on Neutron Scatteringen_AU
dc.subjectElectrical propertiesen_AU
dc.subjectMagnetic fieldsen_AU
dc.subjectCrystal structureen_AU
dc.subjectAntiferromagnetismen_AU
dc.subjectMagnetic momentsen_AU
dc.subjectPhase transformationsen_AU
dc.subjectNeutron diffractionen_AU
dc.subjectSpinen_AU
dc.titleOrigin of magnetoelectric coupling effect and spin dynamics of multiferroic system Co4Nb2O9en_AU
dc.typeConference Abstracten_AU
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