The weak ferromagnetic moment in Ni-doped CuB2O4 can be rotated by applying an electric field. While this implies spin-driven ferroelectricity, no direct evidence of electric polarization has been reported to date. Here we report the induction and control of polarization in the borate in the presence of an external magnetic field. Applying a magnetic field along the  or [11̄0] axis induces electric polarization along the  axis. The polarization is reversed by switching the magnetic-field direction between the  and [11̄0] axes. The mechanism by which electric polarization emerges can be well explained in the framework of spin-dependent metal-ligand hybridization.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2013 May 16|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics