Magnetic properties of CoFe 2O 4 nanoparticles distributed in a multiferroic BiFeO 3 matrix

Keita Sone; Sho Sekiguchi; Hiroshi Naganuma; Takamichi Miyazaki; Takashi Nakajima; Soichiro Okamura

doi:10.1063/1.4729831

Magnetic properties of CoFe ₂O ₄ nanoparticles distributed in a multiferroic BiFeO ₃ matrix

Keita Sone, Sho Sekiguchi, Hiroshi Naganuma, Takamichi Miyazaki, Takashi Nakajima, Soichiro Okamura

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

16 Citations (Scopus)

Abstract

BiFeO ₃-CoFe ₂O ₄ composite thin films were formed on Pt/Ti/SiO ₂/Si(100) substrates by chemical solution deposition from a mixed precursor solution. X-ray diffraction and transmission electron microscopy analyses confirmed that CoFe ₂O ₄ nanoparticles less than 10 nm were uniformly distributed in the BiFeO ₃ matrix. The BiFeO ₃-CoFe ₂O ₄ composite films exhibited the same ferroelectric switching charge as BiFeO ₃ thin films, although a larger applied electric field was necessary. However, the magnetic properties were significantly improved by incorporation of CoFe ₂O ₄ nanoparticles into BiFeO ₃; a saturated magnetization of 80 emu/cm ³ and a magnetic coercive field of 450 Oe were attained at 300 K. Furthermore, the composite films did not show superparamagnetic behavior in zero-field-cooling and field-cooling measurements, which suggest that the thermal fluctuation of CoFe ₂O ₄ nanoparticles was suppressed by exchange coupling with BiFeO ₃.

Original language	English
Article number	124101
Journal	Journal of Applied Physics
Volume	111
Issue number	12
DOIs	https://doi.org/10.1063/1.4729831
Publication status	Published - 2012 Jun 15
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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title = "Magnetic properties of CoFe 2O 4 nanoparticles distributed in a multiferroic BiFeO 3 matrix",

abstract = "BiFeO 3-CoFe 2O 4 composite thin films were formed on Pt/Ti/SiO 2/Si(100) substrates by chemical solution deposition from a mixed precursor solution. X-ray diffraction and transmission electron microscopy analyses confirmed that CoFe 2O 4 nanoparticles less than 10 nm were uniformly distributed in the BiFeO 3 matrix. The BiFeO 3-CoFe 2O 4 composite films exhibited the same ferroelectric switching charge as BiFeO 3 thin films, although a larger applied electric field was necessary. However, the magnetic properties were significantly improved by incorporation of CoFe 2O 4 nanoparticles into BiFeO 3; a saturated magnetization of 80 emu/cm 3 and a magnetic coercive field of 450 Oe were attained at 300 K. Furthermore, the composite films did not show superparamagnetic behavior in zero-field-cooling and field-cooling measurements, which suggest that the thermal fluctuation of CoFe 2O 4 nanoparticles was suppressed by exchange coupling with BiFeO 3.",

author = "Keita Sone and Sho Sekiguchi and Hiroshi Naganuma and Takamichi Miyazaki and Takashi Nakajima and Soichiro Okamura",

note = "Funding Information: This work was partly supported by Grant-in-Aid for challenging Exploratory Research from Japan Society for the Promotion of Science (Grant No. 23656025).",

year = "2012",

month = jun,

day = "15",

doi = "10.1063/1.4729831",

language = "English",

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T1 - Magnetic properties of CoFe 2O 4 nanoparticles distributed in a multiferroic BiFeO 3 matrix

AU - Sone, Keita

AU - Sekiguchi, Sho

AU - Naganuma, Hiroshi

AU - Miyazaki, Takamichi

AU - Nakajima, Takashi

AU - Okamura, Soichiro

N1 - Funding Information: This work was partly supported by Grant-in-Aid for challenging Exploratory Research from Japan Society for the Promotion of Science (Grant No. 23656025).

PY - 2012/6/15

Y1 - 2012/6/15

N2 - BiFeO 3-CoFe 2O 4 composite thin films were formed on Pt/Ti/SiO 2/Si(100) substrates by chemical solution deposition from a mixed precursor solution. X-ray diffraction and transmission electron microscopy analyses confirmed that CoFe 2O 4 nanoparticles less than 10 nm were uniformly distributed in the BiFeO 3 matrix. The BiFeO 3-CoFe 2O 4 composite films exhibited the same ferroelectric switching charge as BiFeO 3 thin films, although a larger applied electric field was necessary. However, the magnetic properties were significantly improved by incorporation of CoFe 2O 4 nanoparticles into BiFeO 3; a saturated magnetization of 80 emu/cm 3 and a magnetic coercive field of 450 Oe were attained at 300 K. Furthermore, the composite films did not show superparamagnetic behavior in zero-field-cooling and field-cooling measurements, which suggest that the thermal fluctuation of CoFe 2O 4 nanoparticles was suppressed by exchange coupling with BiFeO 3.

AB - BiFeO 3-CoFe 2O 4 composite thin films were formed on Pt/Ti/SiO 2/Si(100) substrates by chemical solution deposition from a mixed precursor solution. X-ray diffraction and transmission electron microscopy analyses confirmed that CoFe 2O 4 nanoparticles less than 10 nm were uniformly distributed in the BiFeO 3 matrix. The BiFeO 3-CoFe 2O 4 composite films exhibited the same ferroelectric switching charge as BiFeO 3 thin films, although a larger applied electric field was necessary. However, the magnetic properties were significantly improved by incorporation of CoFe 2O 4 nanoparticles into BiFeO 3; a saturated magnetization of 80 emu/cm 3 and a magnetic coercive field of 450 Oe were attained at 300 K. Furthermore, the composite films did not show superparamagnetic behavior in zero-field-cooling and field-cooling measurements, which suggest that the thermal fluctuation of CoFe 2O 4 nanoparticles was suppressed by exchange coupling with BiFeO 3.

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Magnetic properties of CoFe ₂O ₄ nanoparticles distributed in a multiferroic BiFeO ₃ matrix

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