Abstract
Compositional and temperature evolution of crystal structure and magnetic properties of the BiFeO3-based compounds co-doped with Ca and transition metal ions - Mn, Ti or Nb was studied with X-ray diffraction and vibrating sample magnetometer techniques. It has been shown that the chemical substitution allows to vary structural parameters, thus modifying magnetic state of the parent cycloidal antiferromagnet. Regardless the type of transition elements, the changes in chemical composition result in a lattice compression, reduce rhombohedral distortions and stabilize a non-polar orthorhombic structure specific to the paraelectric state of BiFeO3. In all the systems, the co-doping gives rise to the disruption of the spatially modulated antiferromagnetic structure, thus providing the formation of a non-collinear antiferromagnetic order. In the Ca|Ti and Ca|Nb series, the chemical substitution leads to the stabilization of the weak ferromagnetic polar state with remnant magnetization up to 0.25 emu/g. Magnetic properties of the compounds co-doped with Ca and Mn ions are characterized by maximal remnant magnetization of about 0.07 emu/g. The factors driving the structural evolution and modification of magnetic behavior are discussed.
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