Multiferroic Properties of Pure and Transition Metal Doped LaFeO3 Nanoparticles

Abstract

The size, doping concentration, and magnetic field dependences of the magnetization M and the real part of the dielectric function (Formula presented.) in doped (Formula presented.) nanoparticles (NPs) are studied using a microscopic model. Although M increases, (Formula presented.) decreases with decreasing NPs size in pure (Formula presented.). Doping with different ions causes different strain which modifies the exchange interaction. As a consequence, M and (Formula presented.) grow with increasing Mn or Zn ion doping, whereas both quantities decrease by doping with Ti or Al ions. The magneto-dielectric coefficient increases with an applied external magnetic field and Mn doping concentration in pure and Mn-doped LaFeO3 indicating that pure and doped (Formula presented.) NPs exhibit a multiferroic behavior. A microscopic model is proposed to study multiferroic Bi2NiMnO6 thin films.