Magnetic properties of CoFe2O4 nanoparticles distributed in a multiferroic BiFeO3 matrix

被引：15

作者：

Sone, Keita ^{[1
]}

Sekiguchi, Sho ^{[1
]}

Naganuma, Hiroshi ^{[2
]}

Miyazaki, Takamichi ^{[3
]}

Nakajima, Takashi ^{[1
]}

Okamura, Soichiro ^{[1
]}

机构：

[1] Tokyo Univ Sci, Dept Appl Phys, Fac Sci, Shinjuku Ku, Tokyo 1628601, Japan

[2] Tohoku Univ, Dept Appl Phys, Aoba Ku, Sendai, Miyagi 9808579, Japan

[3] Tohoku Univ, Dept Instrumental Anal, Aoba Ku, Sendai, Miyagi 9808579, Japan

来源：

JOURNAL OF APPLIED PHYSICS | 2012年 / 111卷 / 12期

基金：

日本学术振兴会;

关键词：

POLARIZATION; FILMS;

D O I：

10.1063/1.4729831

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

BiFeO3-CoFe2O4 composite thin films were formed on Pt/Ti/SiO2/Si(100) substrates by chemical solution deposition from a mixed precursor solution. X-ray diffraction and transmission electron microscopy analyses confirmed that CoFe2O4 nanoparticles less than 10 nm were uniformly distributed in the BiFeO3 matrix. The BiFeO3-CoFe2O4 composite films exhibited the same ferroelectric switching charge as BiFeO3 thin films, although a larger applied electric field was necessary. However, the magnetic properties were significantly improved by incorporation of CoFe2O4 nanoparticles into BiFeO3; 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 CoFe2O4 nanoparticles was suppressed by exchange coupling with BiFeO3. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4729831]

引用

页数：5

共 23 条

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