Domain walls in magnetic and multiferroic undoped manganites

We study the structure and properties of Domain Walls in antiferromagnetic and in multiferroic undoped manganites. We use a model Hamiltonian [1] including double exchange, neareast and next nearest neighbors superexchange, and Jahn Teller distortions; the effect of the Dzyaloshinskii-Moriya interaction is also considered. As magnetism, electronic density, and lattice are strongly coupled in these systems, a gradient in one of these properties has remarkable effects in the others. We find interesting effects such as finite conductance at a magnetic domain wall within an insulating material, or electric dipoles associated with with an antiferromagnetic domain wall, for different values of the parameters. The possibility of observing these effects in real undoped manganites is discussed. [1] S. Dong {\it et al}, Phys. Rev. B 78, 155121 (2008)