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Through analysis of single crystal neutron diffraction data, we present themagnetic structures of magnetoelectric Co4Nb2O9 under various magnetic fields.In zero-field, neutron diffraction experiments below TN=27 K reveal that theCo2+ moments order primarily along the a* direction without any spin cantingalong the c axis, manifested by the magnetic symmetry C2/c'. The moments ofnearest neighbor Co atoms order ferromagnetically with a small cant away fromthe next nearest neighbor Co moments along the c axis. In the applied magneticfield H//a, three magnetic domains were aligned with their major magneticmoments perpendicular to the magnetic field with no indication of magneticphase transitions. The influences of magnetic fields on the magnetic structuresassociated with the observed magnetoelectric coupling are discussed.

Noncollinear magnetic structure and magnetoelectric coupling in buckled honeycomb Co$_4$Nb$_2$O$_9$:A single crystal neutron diffraction study