Magnetodielectric coupling in core/shell BaTiO3/γ-Fe2O3 nanoparticles

被引：56
作者：
Koo, Y. S. [1 ]
Bonaedy, T.
Sung, K. D.
Jung, J. H.
Yoon, J. B.
Jo, Y. H.
Jung, M. H.
Lee, H. J.
Koo, T. Y.
Jeong, Y. H.
机构：
[1] Inha Univ, Dept Phys, Inchon, South Korea
[2] Korea Bas Sci Inst, Quantum Mat Res Team, Taejon 305333, South Korea
[3] Pohang Univ Sci & Technol, Dept Phys, Pohang Accelerator Lab, Pohang 790784, South Korea
来源：
APPLIED PHYSICS LETTERS | 2007年 / 91卷 / 21期
基金：
新加坡国家研究基金会;
关键词：
D O I：
10.1063/1.2817940
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We report an intriguing magnetodielectric coupling in BaTiO3/gamma-Fe2O3 dielectric core/ferrimagnetic shell nanoparticles. The dielectric constant steeply increases with magnetic field, and the frequency dependent magnetodielectric curve shows a resonancelike peak at high temperatures, while it decreases smoothly with field and no peak appears in the frequency dependent magnetodielectric curve at low temperatures. We attribute the observed magnetodielectric coupling to the Maxwell-Wagner effect combined with magnetoresistance at high temperatures and to possible spin-lattice coupling and its modification near interfaces at low temperatures. (C) 2007 American Institute of Physics.
引用
收藏
页数：3
相关论文
共 15 条
[1]   Resistive magnetodielectric property of polycrystalline γ-Fe2O3 [J].
Bonaedy, T. ;
Koo, Y. S. ;
Sung, K. D. ;
Jung, J. H. .
APPLIED PHYSICS LETTERS, 2007, 91 (13)
[2]   Magnetocapacitance without magnetoelectric coupling [J].
Catalan, G .
APPLIED PHYSICS LETTERS, 2006, 88 (10)
[3]   Enhanced magnetoelectric effect in core-shell particulate composites [J].
Corral-Flores, V. ;
Bueno-Baques, D. ;
Carrillo-Flores, D. ;
Matutes-Aquino, J. A. .
JOURNAL OF APPLIED PHYSICS, 2006, 99 (08)
[4]   Spin-polarized transport across sharp antiferromagnetic boundaries [J].
Eerenstein, W ;
Palstra, TTM ;
Saxena, SS ;
Hibma, T .
PHYSICAL REVIEW LETTERS, 2002, 88 (24) :4-247204
[5]   Influence of dipolar interaction on magnetic properties of ultrafine ferromagnetic particles [J].
García-Otero, J ;
Porto, M ;
Rivas, J ;
Bunde, A .
PHYSICAL REVIEW LETTERS, 2000, 84 (01) :167-170
[6]   Magnetoelectric coupling in ε-Fe2O3 nanoparticles [J].
Gich, M ;
Frontera, C ;
Roig, A ;
Fontcuberta, J ;
Molins, E ;
Bellido, N ;
Simon, C ;
Fleta, C .
NANOTECHNOLOGY, 2006, 17 (03) :687-691
[7]   Electric polarization reversal and memory in a multiferroic material induced by magnetic fields [J].
Hur, N ;
Park, S ;
Sharma, PA ;
Ahn, JS ;
Guha, S ;
Cheong, SW .
NATURE, 2004, 429 (6990) :392-395
[8]   Magnetocapacitance effect in multiferroic BiMnO3 -: art. no. 180401 [J].
Kimura, T ;
Kawamoto, S ;
Yamada, I ;
Azuma, M ;
Takano, M ;
Tokura, Y .
PHYSICAL REVIEW B, 2003, 67 (18)
[9]   Magnetic control of ferroelectric polarization [J].
Kimura, T ;
Goto, T ;
Shintani, H ;
Ishizaka, K ;
Arima, T ;
Tokura, Y .
NATURE, 2003, 426 (6962) :55-58
[10]   Positive and negative magnetocapacitance in magnetic nanoparticle systems [J].
Lawes, G. ;
Tackett, R. ;
Adhikary, B. ;
Naik, R. ;
Masala, O. ;
Seshadri, R. .
APPLIED PHYSICS LETTERS, 2006, 88 (24)
12