Abstract
Pure BiFeO3 (BFO) and Tb, Mn co-doped BiFeO3 (BTFMO) thin films were deposited on SnO2: F (FTO)/glass substrates using a chemical solution deposition method. Detailed investigations were made on the influence of (Tb, Mn) co-doping on the structure change and the electric properties of the BFO films. With the co-doping of Tb and Mn, the structural transformation from rhombohedral R3c to triclinic P1 is confirmed through XRD, Rietveld refinement and Raman analysis. XPS analysis clarifies that (Tb, Mn) co-doping avails to decrease oxygen vacancy concentration, showing less Fe2+ ions in the co-doped BTFMO thin films than that of the pure BFO thin film. Among the co-doped thin films, the BTFM1O film shows the highly enhanced ferroelectric properties with a giant remnant polarization value (2Pr=180.3μC/cm2). The structural transformation, the well-distributed fine grains and the reduction of leakage current favor enhanced ferroelectric property of (Tb, Mn) co-doped BFO films. It is also found that the BTFM1O film shows the enhanced ferromagnetism with the saturated magnetization (Ms=2.5emu/cm3) as a result of the collapse of space modulated spin structure by the structure transformation.
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