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Magnetoelectric multiferroic composite of two types of multiferroic (Type Iand II) consisting BiFeO3 and TbMnO3 is studied for enhanced magnetic andtransport properties. A narrower band gap is estimated from the UV-visibleabsorption spectrum from that of BiFeO3 and TbMnO3. With known value of bandgap, the band structure was estimated from the valence band x-ray photoemissionspectra (XPS) and ultra violet photoemission spectra (UPS). The valence andconduction band was found at 1.0 eV and 0.45 eV above and below the Fermi levelrespectively. Thus the insulating behavior of the system is understood from thereconstruction of the energy bands at the interface which happens due tolattice mismatch of the two materials. The large coercivity and the increase onthe magnetization value are understood to be due to superexchange interactionbetween different Mn ions (Mn2+, Mn3+ and Mn4+). From the composition study ofEDXA and core level x-ray photoemission spectra oxygen vacancy was found whichin turn creates the mixed valence state of Mn to maintain the chargeneutrality.

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