Effects of rare earth manganites on structural, ferroelectric, and magnetic properties of BiFeO3 thin films

Abstract

Influence of Zr doping on the structure and ferroelectric properties of BiFeO 3 thin films Structural, electrical, and magnetic properties of chemical solution deposited Bi ( Fe 0.95 Cr 0.05 ) O 3 thin films on platinized silicon substrates

Sequence of structural transitions in BiFeO3–RMnO3 thin films (R=Rare earth)

“…[11,12]. The observation of the large band in the range between 450 and 550 cm À 1 in 20LMBFO, similarly to what is observed in 10RMBFO as well as RMO perovskite, suggests that the Jahn-Teller distortion, related to the presence of Mn ions [3,4], is still active despite the structural transition. For the critical GMBFO system, when the concentration increased beyond 10 mol%, all (A 1 ) vibration modes characteristic of Bi-O bonds at 150, 175, and 223 cm À 1 substantially weaken and fade away at 20 mol%, similarly to LMBFO system, but with appearance of a new feature at approximately 310 cm À 1 (see Fig.…”

“…Based on the present results and our previous Raman investigations [3][4][5], it may be concluded that even small concentrations of RMO, down to 2 mol% lead to destabilizing the structure of BFO; this is in agreement with the report of Khomchenko et al [21] in bulk material, where the initial polar rhombohedral and intermediate antipolar orthorhombic structures characteristic of the low-doped Bi 1À x Ln x FeO 3 could be modified by the presence of Mn as second co doping element to stabilize new phases.…”

“…1(b)). This was already discussed elsewhere [4] as a change into the orthorhombic symmetry with a minimum of the orthorhombic distortion at GdMBFO. The Raman scattering spectra of the system xLMBFO (0rxr20 mol%) are presented in Fig.…”

“…Raman investigation has allowed identifying a structural transition from monoclinic to orthorhombic accompanied with Jahn-Teller distortion in the BiFeO 3 -LaMnO 3 (LMBFO) system [3]. Furthermore, the structure of BFO is decisively influenced by the addition of rare-earth manganites (RMnO 3 (RMO)) and adapts the structure of RMO below 10 mol% with substantial improvement of the ferroelectric properties [4]. Doping with RMO was shown to yield thin films with highest magnetization properties together with good ferroelectric polarization [5] which is suitable for device application.…”

Structural and ferroelectric properties of chemical solution deposited (Nd, Cu) co-doped BiFeO3 thin film

“…and transition metal (Ni, Cr, Ti, Mn, Sc, etc.) ions has been strongly suggested to control the factors which cause large leakage current density and to improve the ferroelectric properties of the BFO [11,12]. The rare earth ions doped into Bi-sites stabilize the perovskite structure, retain the non-centrosymmetry and control the vaporization of Bi ions [9,13,14].…”