Honeycomb-based materials have been attracting a lot of attention owing to their fascinating physics as exemplified by the emergence of a massless Dirac fermion and a spin liquid state. We have investigated magnetoelectric (ME) phenomena in a honeycomb magnet Co4Nb2O9 and observed a unique ME response associated with a simple antiferromagnetic ordering on the honeycomb network. The induced electric polarization changes its direction by an angle -2θ around the trigonal axis upon rotating the magnetic field by an angle θ. We attribute the variation of electric polarization direction in a rotating magnetic field to the continuous rotation of the magnetic moment on the honeycomb. Our findings may open a variety of novel ME responses based on a honeycomb magnet.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics