Structure, ferroelectric/magnetoelectric properties and leakage current density of (Bi0.85Nd0.15)FeO3 thin films

Simões, Alexandre Zirpoli; Cavalcante, L. S.; Moura, F.; Longo, Elson; Varela, José Arana

doi:10.1016/j.jallcom.2011.02.030

Cited by 75 publications

(22 citation statements)

References 97 publications

(97 reference statements)

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“…In order to further confirm and verify the structure of the thin films, the Rietveld refinement of the XRD patterns of pure BFO and BPS 2 FMO films have been performed using the Maud program [15]. The observed, calculated and difference in XRD patterns are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Conduction mechanisms and enhanced multiferroic properties of Sr doped Bi0.85−xPr0.15SrxFe0.97Mn0.03O3 thin films

Yan

Tan

et al. 2015

J Mater Sci: Mater Electron

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Pure BiFeO 3 (BFO) and Bi 0.85-x Pr 0.15 Sr x Fe 0.97 Mn 0.03 O 3 (BPS x FMO, x = 0.02-0.05) thin films were deposited on fluorine-doped SnO 2 (FTO/glass) substrates by a sol-gel method. The systematic studies of crystalline structure, surface morphologies, leakage conduction mechanisms, ferroelectric and magnetic properties of pure BiFeO 3 and Bi 0.85-x Pr 0.15 Sr x Fe 0.97 Mn 0.03 O 3 thin films were investigated. X-ray diffraction patterns, Rietveld analysis and Raman scattering spectra reveal that the (Pr, Sr and Mn) co-doped BiFeO 3 thin films give rise to a trigonal (R3m: R) structure transition with respect to the original rhombohedral structure of pure BiFeO 3 film. Fowler-Nordheim tunneling conduction mechanism dominates the leakage current of all the films in the relatively high electric field. The significantly enhanced ferroelectric properties of the Bi 0.85-x Pr 0.15 Sr x Fe 0.97 Mn 0.03 O 3 thin films were observed in comparison with pure BiFeO 3 film. In addition, the BPS 2 FMO film shows the enhanced ferromagnetism with the saturation magnetization (M s * 1.97 emu cm -3 ), which is almost three times larger than that of pure BFO film (M s * 0.67 emu cm -3 ), as a result of the small grain size effect and the collapse of space modulated spin structure by the structure transition.

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Section: Resultsmentioning

confidence: 99%

Conduction mechanisms and enhanced multiferroic properties of Sr doped Bi0.85−xPr0.15SrxFe0.97Mn0.03O3 thin films

Yan

Tan

et al. 2015

J Mater Sci: Mater Electron

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“…Nd helps in suppressing the formation of secondary phases, reducing the leakage current and improving ferroelectric or magnetic properties, whereas substitution by transition metal ions (Mn þ4 ) reduces the fluctuation of the Fe valence and oxygen vacancies, which is an important factor to reduce the leakage current. [15][16][17][18][19][20][21] Based on the literature, the present doping concentration of Nd and Mn in BFO has been chosen for our studies as this composition shows lowest leakage current with enhanced electrical properties among all the substitutional compositions. 16 In this work, the main aim is to study the structural, dielectric, impedance, magnetic, and magnetoelectric properties of BNFM system.…”

Section: Introductionmentioning

confidence: 99%

Dielectric anomalies due to grain boundary conduction in chemically substituted BiFeO3

Kumari

Ortega

Kumar

et al. 2015

Journal of Applied Physics

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We describe systematic studies on Nd and Mn co-doped BiFeO 3 , i.e., (Bi 0.95 Nd 0.05 ) (Fe 0.97 Mn 0.03 )O 3 (BNFM) polycrystalline electroceramics. Raman spectra and X-ray diffraction patterns revealed the formation of rhombohedral crystal structure at room temperature, and ruled out structural changes in BiFeO 3 (BFO) after low percentage chemical substitution. Strong dielectric dispersion and a sharp anomaly around 620 K observed near the Neel temperature (T N $ 643 K of BFO) support strong magneto-dielectric coupling, verified by the exothermic peak in differential thermal data. Impedance spectroscopy disclosed the appearance of grain boundary contributions in the dielectric data in the region, and their disappearance just near the Neel temperature suggests magnetically active grain boundaries. The resistive grain boundary components of the BNFM are mainly responsible for magneto-dielectric coupling. Capacitive grain boundaries are not observed in the modulus spectra and the dielectric behavior deviates from the ideal Debye-type. The ac conduction studies illustrate short-range order with ionic translations assisted by both large and small polaron hopping. Magnetic studies indicate that the weak antiferromagnetic phase of BNFM ceramics is dominated by a strong paramagnetic response (unsaturated magnetization even at applied magnetic field of 7 T). The bulk BNFM sample shows a good in-plane magnetoelectric coupling (ME) coefficient. V C 2015 AIP Publishing LLC. [http://dx

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“…The magnetization decreases as the concentration of Nd increases from x = 0.00 to x = 0.05, but increases as the concentration of Nd increases from x = 0.075 to x = 0.15. The increase in macroscopic magnetization may be caused by the formation of Fe 2+ ions, by the suppression of inhomogeneous spin structure, and by the change in canting angle [11,20,21]. Because the high-temperature annealing process was done in the presence of oxygen, there would be a valance fluctuation and Fe 3+ in the BFO material was confirmed by other research groups using X-ray photoelectron spectroscopy (XPS) [22,23].…”

Section: Modesmentioning

confidence: 75%

Magnetic Properties and Impedance Spectroscopic Studies of Multiferroic Bi_1-xNd_xFeO₃Materials

Thang¹,

Thao²,

Minh³

2016

Journal of Magnetics

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Nd-doped BiFeO 3 materials were synthesized via a sol-gel method. The crystal structure, magnetic properties, and complex impedance spectroscopy of multiferroic Bi 1-x Nd x FeO 3 (BNFO) materials were investigated by Xray diffraction (XRD), Raman scattering, vibrating sample magnetometer (VSM), and complex impedance spectroscopy. Our results show that the lattice crystal constants (a, c) and the ratio c/a of BNFO materials decreased with increasing Nd concentration. All samples exhibited weak ferromagnetism at room temperature, and the magnetization of samples was enhanced by the presence of Nd 3+ ions. There was an enhancement in the spontaneous magnetization of BFO with increasing Nd concentration, which is attributable to the collapse of the spin cycloid structure.

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Structure, ferroelectric/magnetoelectric properties and leakage current density of (Bi0.85Nd0.15)FeO3 thin films

Cited by 75 publications

References 97 publications

Conduction mechanisms and enhanced multiferroic properties of Sr doped Bi0.85−xPr0.15SrxFe0.97Mn0.03O3 thin films

Conduction mechanisms and enhanced multiferroic properties of Sr doped Bi0.85−xPr0.15SrxFe0.97Mn0.03O3 thin films

Dielectric anomalies due to grain boundary conduction in chemically substituted BiFeO3

Magnetic Properties and Impedance Spectroscopic Studies of Multiferroic Bi_1-xNd_xFeO₃Materials

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Structure, ferroelectric/magnetoelectric properties and leakage current density of (Bi0.85Nd0.15)FeO3 thin films

Cited by 75 publications

References 97 publications

Conduction mechanisms and enhanced multiferroic properties of Sr doped Bi0.85−xPr0.15SrxFe0.97Mn0.03O3 thin films

Conduction mechanisms and enhanced multiferroic properties of Sr doped Bi0.85−xPr0.15SrxFe0.97Mn0.03O3 thin films

Dielectric anomalies due to grain boundary conduction in chemically substituted BiFeO3

Magnetic Properties and Impedance Spectroscopic Studies of Multiferroic Bi1-xNdxFeO3Materials

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Magnetic Properties and Impedance Spectroscopic Studies of Multiferroic Bi_1-xNd_xFeO₃Materials