Study of Band structure, Transport and magnetic properties of BiFeO3-TbMnO3 composite

TL;DR

This study investigates the electronic, magnetic, and transport properties of a BiFeO3-TbMnO3 composite, revealing band structure details, enhanced magnetization, and the role of oxygen vacancies in its multiferroic behavior.

Contribution

It provides new insights into the band structure and magnetic interactions of BiFeO3-TbMnO3 composites, highlighting interface effects and defect roles in multiferroic properties.

Findings

Narrower band gap estimated from UV-visible spectra.

Valence and conduction bands located at 1.0 eV and 0.45 eV.

Oxygen vacancies induce mixed valence states of Mn.

Abstract

Magnetoelectric multiferroic composite of two types of multiferroic (Type I and II) consisting BiFeO3 and TbMnO3 is studied for enhanced magnetic and transport properties. A narrower band gap is estimated from the UV-visible absorption spectrum from that of BiFeO3 and TbMnO3. With known value of band gap, the band structure was estimated from the valence band x-ray photoemission spectra (XPS) and ultra violet photoemission spectra (UPS). The valence and conduction band was found at 1.0 eV and 0.45 eV above and below the Fermi level respectively. Thus the insulating behavior of the system is understood from the reconstruction of the energy bands at the interface which happens due to lattice mismatch of the two materials. The large coercivity and the increase on the magnetization value are understood to be due to superexchange interaction between different Mn ions (Mn2+, Mn3+ and Mn4+). From the composition study of EDXA and core level x-ray photoemission spectra oxygen vacancy was found which in turn creates the mixed valence state of Mn to maintain the charge neutrality.