Effect of Microstrain on the Magnetic Properties of BiFeO3 Nanoparticles

Pavana S.V. Mocherla; C. Karthik; R. Ubic; M. S. Ramachandra Rao; C. Sudakar

doi:10.1063/1.4897143

Effect of Microstrain on the Magnetic Properties of BiFeO3 Nanoparticles

Pavana S.V. Mocherla
, C. Karthik
, R. Ubic
, M. S. Ramachandra Rao
, C. Sudakar

Micron School of Materials Science and Engineering

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

58 Scopus citations

Abstract

We report on size induced microstrain-dependent magnetic properties of BiFeO₃ nanoparticles. The microstrain is found to be high (ε > 0.3%) for smaller crystallite sizes (d < 30 nm), and shows a sharp decrease as the particle size increases. The presence of pseudo-cubic symmetry is evidenced for these nanoparticles. Raman spectral studies suggest straightening of the Fe-O-Fe bond angle accompanied by a decrease in FeO₆ octahedral rotation for d < 65 nm. The magnetization shows a dip around 30 nm, half the size of spin cycloid length for BiFeO₃, due to a decrease in rhombohedral distortion with crystallite size. We also observe a similar trend in the T_N with respect to size indicating that the microstrain plays a significant role in controlling the magnetic property of BiFeO₃.

Original language	American English
Article number	132409
Journal	Applied Physics Letters
Volume	105
Issue number	13
DOIs	https://doi.org/10.1063/1.4897143
State	Published - 29 Sep 2014

Keywords

nanoparticles
ferromagnetism
nanomagnetism
raman spectra
x-ray
diffraction

EGS Disciplines

Materials Science and Engineering

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10.1063/1.4897143

https://doi.org/10.1063/1.4897143

Cite this

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title = "Effect of Microstrain on the Magnetic Properties of BiFeO3 Nanoparticles",

abstract = "We report on size induced microstrain-dependent magnetic properties of BiFeO3 nanoparticles. The microstrain is found to be high (ε > 0.3\%) for smaller crystallite sizes (d < 30 nm), and shows a sharp decrease as the particle size increases. The presence of pseudo-cubic symmetry is evidenced for these nanoparticles. Raman spectral studies suggest straightening of the Fe-O-Fe bond angle accompanied by a decrease in FeO6 octahedral rotation for d < 65 nm. The magnetization shows a dip around 30 nm, half the size of spin cycloid length for BiFeO3, due to a decrease in rhombohedral distortion with crystallite size. We also observe a similar trend in the TN with respect to size indicating that the microstrain plays a significant role in controlling the magnetic property of BiFeO3.",

keywords = "nanoparticles, ferromagnetism, nanomagnetism, raman spectra, x-ray, diffraction",

author = "Mocherla, \{Pavana S.V.\} and C. Karthik and R. Ubic and \{Ramachandra Rao\}, \{M. S.\} and C. Sudakar",

note = "Publisher Copyright: {\textcopyright} 2014 AIP Publishing LLC.",

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month = sep,

day = "29",

doi = "10.1063/1.4897143",

language = "American English",

volume = "105",

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TY - JOUR

T1 - Effect of Microstrain on the Magnetic Properties of BiFeO3 Nanoparticles

AU - Mocherla, Pavana S.V.

AU - Karthik, C.

AU - Ubic, R.

AU - Ramachandra Rao, M. S.

AU - Sudakar, C.

PY - 2014/9/29

Y1 - 2014/9/29

N2 - We report on size induced microstrain-dependent magnetic properties of BiFeO3 nanoparticles. The microstrain is found to be high (ε > 0.3%) for smaller crystallite sizes (d < 30 nm), and shows a sharp decrease as the particle size increases. The presence of pseudo-cubic symmetry is evidenced for these nanoparticles. Raman spectral studies suggest straightening of the Fe-O-Fe bond angle accompanied by a decrease in FeO6 octahedral rotation for d < 65 nm. The magnetization shows a dip around 30 nm, half the size of spin cycloid length for BiFeO3, due to a decrease in rhombohedral distortion with crystallite size. We also observe a similar trend in the TN with respect to size indicating that the microstrain plays a significant role in controlling the magnetic property of BiFeO3.

AB - We report on size induced microstrain-dependent magnetic properties of BiFeO3 nanoparticles. The microstrain is found to be high (ε > 0.3%) for smaller crystallite sizes (d < 30 nm), and shows a sharp decrease as the particle size increases. The presence of pseudo-cubic symmetry is evidenced for these nanoparticles. Raman spectral studies suggest straightening of the Fe-O-Fe bond angle accompanied by a decrease in FeO6 octahedral rotation for d < 65 nm. The magnetization shows a dip around 30 nm, half the size of spin cycloid length for BiFeO3, due to a decrease in rhombohedral distortion with crystallite size. We also observe a similar trend in the TN with respect to size indicating that the microstrain plays a significant role in controlling the magnetic property of BiFeO3.

KW - nanoparticles

KW - ferromagnetism

KW - nanomagnetism

KW - raman spectra

KW - x-ray

KW - diffraction

UR - https://scholarworks.boisestate.edu/mse_facpubs/206

UR - https://doi.org/10.1063/1.4897143

U2 - 10.1063/1.4897143

DO - 10.1063/1.4897143

M3 - Article

SN - 0003-6951

VL - 105

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 13

M1 - 132409

ER -

Effect of Microstrain on the Magnetic Properties of BiFeO3 Nanoparticles

Abstract

Keywords

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