Magnetic, dielectric and magnetoelectric properties of BiFeO3-CoFe2O4nanocomposites

Anusree Das; Sayan De; Sudipta Bandyopadhyay; Souvik Chatterjee; Dipankar Das

doi:10.1016/j.jallcom.2016.12.128

Magnetic, dielectric and magnetoelectric properties of BiFeO₃-CoFe₂O₄nanocomposites

Anusree Das, Sayan De, Sudipta Bandyopadhyay, Souvik Chatterjee, Dipankar Das

Research output: Contribution to journal › Article › peer-review

39 Scopus citations

Abstract

Nanocomposites (NCs) comprising BiFeO₃(BFO) and CoFe₂O₄(CFO) with nominal composition, x CoFe₂O₄- (1-x) BiFeO₃(x = 0.2, 0.3 and 0.4) have been synthesized adopting a sol-gel route. XRD patterns of the prepared samples exhibit presence of both BFO and CFO crystalline phases. TEM images of the NCs show that particles are mostly spherical with size in the range 15–25 nm. Room temperature Mössbauer spectra of the pristine samples and NCs reveal presence of Fe³⁺ions at different inequivalent sites of BFO and CFO. Room temperature dc magnetization measurements show significant enhancement in magnetization of the NCs compared to that of the pristine BFO. Variation of dielectric constant of the NCs with frequency shows a dispersive behavior in low frequency region which is attributed to grain boundary relaxation in the NCs. ε_r– T curves of all samples exhibit an anomaly near the antiferromagnetic transition temperature of BFO indicating presence of magnetoelectric (ME) coupling. Variation of capacitance of the NCs in presence of external magnetic field confirms an improvement of ME coupling in BFO after formation of the NCs.

Original language	English
Pages (from-to)	353-360
Number of pages	8
Journal	Journal of Alloys and Compounds
Volume	697
DOIs	https://doi.org/10.1016/j.jallcom.2016.12.128
State	Published - 2017
Externally published	Yes

Bibliographical note

Funding Information:
The author A. Das thanks University Grants Commission (UGC), New Delhi, for providing Senior Research Fellowship. Authors would like to thank Mr. Binoy Krishna Hazra, School of Physics, University of Hyderabad, for high temperature dielectric measurements. Authors acknowledge Department of Science and Technology, India (Project no. IR/S2/PU-06/2006) for low temperature high magnetic field facility at UGC-DAE Consortium for Scientific Research, Kolkata Centre.

Publisher Copyright:
© 2016 Elsevier B.V.

Keywords

Ferrite
Mössbauer spectroscopy
Nanocomposites

Access to Document

10.1016/j.jallcom.2016.12.128

Cite this

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title = "Magnetic, dielectric and magnetoelectric properties of BiFeO3-CoFe2O4nanocomposites",

abstract = "Nanocomposites (NCs) comprising BiFeO3(BFO) and CoFe2O4(CFO) with nominal composition, x CoFe2O4- (1-x) BiFeO3(x = 0.2, 0.3 and 0.4) have been synthesized adopting a sol-gel route. XRD patterns of the prepared samples exhibit presence of both BFO and CFO crystalline phases. TEM images of the NCs show that particles are mostly spherical with size in the range 15–25 nm. Room temperature M{\"o}ssbauer spectra of the pristine samples and NCs reveal presence of Fe3+ions at different inequivalent sites of BFO and CFO. Room temperature dc magnetization measurements show significant enhancement in magnetization of the NCs compared to that of the pristine BFO. Variation of dielectric constant of the NCs with frequency shows a dispersive behavior in low frequency region which is attributed to grain boundary relaxation in the NCs. εr– T curves of all samples exhibit an anomaly near the antiferromagnetic transition temperature of BFO indicating presence of magnetoelectric (ME) coupling. Variation of capacitance of the NCs in presence of external magnetic field confirms an improvement of ME coupling in BFO after formation of the NCs.",

keywords = "Ferrite, M{\"o}ssbauer spectroscopy, Nanocomposites",

author = "Anusree Das and Sayan De and Sudipta Bandyopadhyay and Souvik Chatterjee and Dipankar Das",

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doi = "10.1016/j.jallcom.2016.12.128",

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AU - De, Sayan

AU - Bandyopadhyay, Sudipta

AU - Chatterjee, Souvik

AU - Das, Dipankar

PY - 2017

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N2 - Nanocomposites (NCs) comprising BiFeO3(BFO) and CoFe2O4(CFO) with nominal composition, x CoFe2O4- (1-x) BiFeO3(x = 0.2, 0.3 and 0.4) have been synthesized adopting a sol-gel route. XRD patterns of the prepared samples exhibit presence of both BFO and CFO crystalline phases. TEM images of the NCs show that particles are mostly spherical with size in the range 15–25 nm. Room temperature Mössbauer spectra of the pristine samples and NCs reveal presence of Fe3+ions at different inequivalent sites of BFO and CFO. Room temperature dc magnetization measurements show significant enhancement in magnetization of the NCs compared to that of the pristine BFO. Variation of dielectric constant of the NCs with frequency shows a dispersive behavior in low frequency region which is attributed to grain boundary relaxation in the NCs. εr– T curves of all samples exhibit an anomaly near the antiferromagnetic transition temperature of BFO indicating presence of magnetoelectric (ME) coupling. Variation of capacitance of the NCs in presence of external magnetic field confirms an improvement of ME coupling in BFO after formation of the NCs.

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