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Title: Enhanced magnetoelectric properties of BiFeO{sub 3} on formation of BiFeO{sub 3}/SrFe{sub 12}O{sub 19} nanocomposites

Abstract

Nanocomposites (NCs) comprising (1−x) BiFeO{sub 3} (BFO) and x SrFe{sub 12}O{sub 19} (SRF) (x = 0.1, 0.2, 0.3, and 0.4) have been prepared by a sol-gel route. Presence of pure phases of both BiFeO{sub 3} (BFO) and SrFe{sub 12}O{sub 19} (SRF) in the NCs for x = 0.3 and 0.4 has been confirmed by Rietveld analysis of XRD data though a minor impurity phase is observed in the case of x = 0.1 and 0.2 NCs. Transmission electron micrographs of the NCs show that particles are mostly spherical with average size of 30 nm. M-H measurements at 300 and 10 K indicate predominantly ferrimagnetic behavior of all the NCs with an increasing trend of saturation magnetization values with increasing content of SRF. Dielectric constant (ε{sub r}) of the NCs at room temperature shows a dispersive behavior with frequency and attains a constant value at higher frequency. ε{sub r} − T measurements reveal an increasing trend of dielectric constant of the NCs with increasing temperature and show an anomaly around the antiferromagnetic transition temperature of BFO, which indicates magnetoelectric coupling in the NCs. The variation of capacitance in the presence of magnetic field confirms the enhancement of magnetoelectric effect in the NCs. {sup 57}Fe Mössbauer spectroscopy results indicate themore » presence of only Fe{sup 3+} ions in usual crystallographic sites of BFO and SRF.« less

Authors:
; ;  [1];  [2]
  1. UGC-DAE Consortium for Scientific Research, Kolkata Centre, III/LB-8, Bidhannagar, Kolkata 700098 (India)
  2. Department of Physics, University of Calcutta, Kolkata 700009 (India)
Publication Date:
OSTI Identifier:
22596811
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 119; Journal Issue: 23; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ANTIFERROMAGNETISM; AUGMENTATION; BISMUTH OXIDES; CAPACITANCE; CRYSTALLOGRAPHY; DIELECTRIC MATERIALS; IMPURITIES; IRON 57; IRON IONS; MAGNETIC FIELDS; MAGNETIC PROPERTIES; MAGNETIZATION; MOESSBAUER SPECTROMETERS; NANOCOMPOSITES; PERMITTIVITY; SOL-GEL PROCESS; SPHERICAL CONFIGURATION; TEMPERATURE RANGE 0273-0400 K; TRANSITION TEMPERATURE; X-RAY DIFFRACTION

Citation Formats

Das, Anusree, Chatterjee, Souvik, Das, Dipankar, E-mail: ddas@alpha.iuc.res.in, and Bandyopadhyay, Sudipta. Enhanced magnetoelectric properties of BiFeO{sub 3} on formation of BiFeO{sub 3}/SrFe{sub 12}O{sub 19} nanocomposites. United States: N. p., 2016. Web. doi:10.1063/1.4954075.
Das, Anusree, Chatterjee, Souvik, Das, Dipankar, E-mail: ddas@alpha.iuc.res.in, & Bandyopadhyay, Sudipta. Enhanced magnetoelectric properties of BiFeO{sub 3} on formation of BiFeO{sub 3}/SrFe{sub 12}O{sub 19} nanocomposites. United States. doi:10.1063/1.4954075.
Das, Anusree, Chatterjee, Souvik, Das, Dipankar, E-mail: ddas@alpha.iuc.res.in, and Bandyopadhyay, Sudipta. 2016. "Enhanced magnetoelectric properties of BiFeO{sub 3} on formation of BiFeO{sub 3}/SrFe{sub 12}O{sub 19} nanocomposites". United States. doi:10.1063/1.4954075.
@article{osti_22596811,
title = {Enhanced magnetoelectric properties of BiFeO{sub 3} on formation of BiFeO{sub 3}/SrFe{sub 12}O{sub 19} nanocomposites},
author = {Das, Anusree and Chatterjee, Souvik and Das, Dipankar, E-mail: ddas@alpha.iuc.res.in and Bandyopadhyay, Sudipta},
abstractNote = {Nanocomposites (NCs) comprising (1−x) BiFeO{sub 3} (BFO) and x SrFe{sub 12}O{sub 19} (SRF) (x = 0.1, 0.2, 0.3, and 0.4) have been prepared by a sol-gel route. Presence of pure phases of both BiFeO{sub 3} (BFO) and SrFe{sub 12}O{sub 19} (SRF) in the NCs for x = 0.3 and 0.4 has been confirmed by Rietveld analysis of XRD data though a minor impurity phase is observed in the case of x = 0.1 and 0.2 NCs. Transmission electron micrographs of the NCs show that particles are mostly spherical with average size of 30 nm. M-H measurements at 300 and 10 K indicate predominantly ferrimagnetic behavior of all the NCs with an increasing trend of saturation magnetization values with increasing content of SRF. Dielectric constant (ε{sub r}) of the NCs at room temperature shows a dispersive behavior with frequency and attains a constant value at higher frequency. ε{sub r} − T measurements reveal an increasing trend of dielectric constant of the NCs with increasing temperature and show an anomaly around the antiferromagnetic transition temperature of BFO, which indicates magnetoelectric coupling in the NCs. The variation of capacitance in the presence of magnetic field confirms the enhancement of magnetoelectric effect in the NCs. {sup 57}Fe Mössbauer spectroscopy results indicate the presence of only Fe{sup 3+} ions in usual crystallographic sites of BFO and SRF.},
doi = {10.1063/1.4954075},
journal = {Journal of Applied Physics},
number = 23,
volume = 119,
place = {United States},
year = 2016,
month = 6
}
  • Graphical abstract: Polycrystalline nanocomposites of xCo{sub 0.7}Zn{sub 0.3}Fe{sub 2}O{sub 4}–(1 − x)Bi{sub 0.9}La{sub 0.1}FeO{sub 3} (x = 0.1, 0.2, 0.3 and 0.4) were prepared by sol–gel method with average crystallite size in the range 70–80 nm as confirmed by AFM image. Magnetization (M) and magnetocapacitance (MC) were found to be enhanced for the nanocomposite. Highlights: ► Co{sub 0.7}Zn{sub 0.3}Fe{sub 2}O{sub 4}–Bi{sub 0.9}La{sub 0.1}FeO{sub 3} nanocomposites (grain size ∼ 90 nm) prepared by sol–gel method. ► Magnetization (M) was found 4.5% more than 0.4CoFe{sub 2}O{sub 4}–0.6BiFeO{sub 3} composite. ► Magnetocapacitance (MC) is observed higher compared to Ba doped BiFeO{sub 3}. ►more » The value of α{sub E} was found to be 10% more than some reported. - Abstract: We report the magnetoelectric, dielectric and magnetic properties of xCo{sub 0.7}Zn{sub 0.3}Fe{sub 2}O{sub 4}–(1 − x)Bi{sub 0.9}La{sub 0.1}FeO{sub 3} (x = 0.1, 0.2, 0.3 and 0.4) nanocomposites prepared by sol–gel method. The X-ray diffraction patterns of sintered pellets show the formation of composite phases. The average crystallite size obtain by Williamson–Hall plot for different nanocomposites were found to be in the range 70–80 nm, which are in agreement with particle size calculated from atomic force microscopy. Magnetoelectric voltage coefficient (α{sub E} = 315 mV/cm Oe) and the magnetocapacitance (MC = 3.1%) for x = 0.3 were found to be higher than other synthesized nanocomposites.« less
  • Nanocomposites of hard (SrFe{sub 12}O{sub 19}) and soft ferrite (CoFe{sub 2}O{sub 4}) are prepared by mixing individual ferrite components at appropriate weight ratio and subsequent heat treatment. The magnetization of the composites showed hysteresis loop that is characteristic of the exchange spring system. The variation of J{sub r}/J{sub r}(∞) vs. J{sub d}/ J{sub r}(∞) for these nanocomposites are investigated to understand the presence of both the interacting field and the disorder in the system. This is further corroborated with the First Order Reversal Curve analysis (FORC) on the nanocomposites of 1:4 (Cobalt Ferrite: Strontium Ferrite) and 1:16 (Cobalt Ferrite: Strontiummore » Ferrite). The FORC distribution reveals that the pinning mechanism is stronger in the nanocomposite of 1:4 compared to 1:16. However, the nanocomposite of 1:16 exhibit superior exchange coupling strength in contrast to 1:4. The asymmetric nature of the FORC distribution at H{sub c} = 0 Oe for both the nanocomposites validates the intercoupling between the reversible and irreversible magnetization.« less
  • The BiFeO{sub 3} ceramics were prepared by sol-gel method (BFO-1) and high-pressure synthesis (BFO-2). X-ray diffraction showed that these ceramics are almost of single phase. It is difficult to observe a ferroelectric loop of BFO-1 even at an electric field of 6 kV/cm. Compared to BFO-1, the high-pressure synthesized one has higher resistivity, higher density, and better crystallization. Under an applied electric field of 120 kV/cm, the values of remanent polarization and the coercive field are 46 {mu}C/cm{sup 2} and 73 kV/cm, respectively. At room temperature, a magnetic hysteresis loop with enhanced magnetization can be observed in BFO-2.
  • The magnetic properties of polycrystalline Bi{sub 1-x}Ho{sub x}Fe{sub 1-y}Ni{sub y}O{sub 3} (x = 0, 0.1; y = 0, 0.03), which were prepared by the solid-state method, have been investigated. The powder X-ray diffraction reveals that all the samples are polycrystalline and show rhombohedral perovskite structure. The micro-Raman scattering studies confirm that Bi{sub 0.9}Ho{sub 0.1}Fe{sub 0.97}Ni{sub 0.03}O{sub 3} has a compressive lattice distortion induced by the simultaneous substitution of Ho and Ni ions at A and B-sites, respectively. From the magnetization dependences at room temperature, Bi{sub 0.9}Ho{sub 0.1}Fe{sub 0.97}Ni{sub 0.03}O{sub 3} has enhanced magnetization (0.2280 emu/g) and low coercive field (280 Oe). It was revealed that themore » Ni dopant plays an important role for the improved ferromagnetic properties and the Ho dopant favors the magnetic exchange interactions in the co-doped ceramic.« less
  • BiFeO{sub 3} multiferroic ceramics were modified by introducing (Sr{sub 0.5}Ca{sub 0.5})TiO{sub 3} to form solid solutions. The single phase structure was easy to be obtained in Bi{sub 1−x}(Sr{sub 0.5}Ca{sub 0.5}){sub x}Fe{sub 1−x}Ti{sub x}O{sub 3} (x = 0.2, 0.25, 0.3, and 0.4) solid solutions. Rietveld refinement of X-ray diffraction data revealed a transition from rhombohedral R3c (x = 0.2, 0.25, and 0.3) to orthorhombic Pnma (x = 0.4). Current density-field (J-E) characteristics indicated that the leakage current density was reduced by three orders of magnitude in Bi{sub 1−x}(Sr{sub 0.5}Ca{sub 0.5}){sub x}Fe{sub 1−x}Ti{sub x}O{sub 3} ceramics. Both the ferroelectricity and magnetic properties were significantly enhanced in the presentmore » solid solutions. P-E hysteresis loop measurements with dynamic leakage current compensation methods showed the significantly enhanced ferroelectric properties for x = 0.25 and 0.3 and the paraelectric behavior for x = 0.4. The best ferromagnetic characteristics were achieved in the composition of x = 0.25, where the saturated M-H loop was determined with M{sub r} = 34.8 emu/mol. The improvement of ferroelectricity was mainly due to the suppressed leakage current, and the enhanced magnetism originated from the partial substitution of Fe{sup 3+} by Ti{sup 4+}, which destroyed its previous spiral structure to allow the appearance of a macroscopic magnetization.« less