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

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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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day = "29",

doi = "10.1063/1.4897143",

language = "American English",

volume = "105",

number = "13",

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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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