Abstract
We present LuMnCoO, a multiferroic member of the double perovskites that we have investigated using x-ray and neutron diffraction, specific heat, magnetization, electric polarization, and dielectric constant measurements. This material possesses a net electric polarization strongly coupled to a net magnetization below 35 K, despite the antiferromagnetic ordering of the Mn and Co spins in an configuration along the direction. We discuss the magnetic order in terms of a condensation of domain boundaries between and ferromagnetic domains, with each domain boundary producing an electric polarization due to spatial inversion symmetry breaking. In an applied magnetic field the domain boundaries slide, controlling the size of the magnetization, electric polarization, and magnetoelectric coupling.
2 More- Received 10 May 2011
DOI:https://doi.org/10.1103/PhysRevB.84.134427
©2011 American Physical Society