Artificial multiferroic structures based on barium-strontium titanate

Artificial extrinsic and intrinsic multiferroic structures were developed in the form of yttrium-iron garnet/barium-strontium titanate bi-layers and manganese-doped barium-strontium titanate films with a relatively high doping rate in the range of 10–20 mol%. For the experimental investigations, the planar capacitors were formed on the surfaces of the structures and the capacitance–voltage characteristics were measured. Structural characterization of the samples under study was based on X-ray diffraction analysis and film–substrate interfaces were investigated by X-ray photoelectron spectroscopy. The relative dielectric permittivity, dielectric loss tangent, and electric field tunability of the samples were measured in a temperature range from 77 to 300 К. The additional 6 and 3 % tuning of the dielectric permittivity by external magnetic field of 2000 Oe was demonstrated for the extrinsic and intrinsic structures, respectively.