Magnetic, optical and electric properties of ion doped NdFeO3 nanoparticles

Magnetic, optical and electric properties of ion doped NdFeO3 nanoparticles are investigated on microscopic level using a microscopic model and the Green’s function theory. By substitution of Fe or Nd with different ions, due to the difference of the ionic radii between the doping and host ions appear different strains. They change the exchange interaction constants which are depending on the lattice parameters and so lead to different physical properties. The magnetization increases by doping with Cu(Nd) and Co(Fe) and decreases by doping with Sr(Nd) and Ni(Fe). The band gap energy decreases in the first two cases and increases in the last two ones. We have shown that in dependence of the substitution of Mg and Sm ions at Fe or Nd sites, there appears different strain which leads to different behavior of the physical properties. The size dependence of and is also observed. The behavior of the polarization in ion doped NdFeO3 nanoparticles is discussed, too. The obtained results are in good qualitative agreement with the experimental data.