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Coupling interaction in multiferroic BaTiO3-CoFe2O4 nanostructures

被引：73
作者：
Liu, G
Nan, CW [1 ]
Xu, ZK
Chen, HD
机构：
[1] Tsinghua Univ, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China
[2] Tsinghua Univ, Dept Mat Sci & Engn, Beijing 100084, Peoples R China
[3] City Univ Hong Kong, Dept Phys & Mat Sci, Kowloon, Hong Kong, Peoples R China
来源：
JOURNAL OF PHYSICS D-APPLIED PHYSICS | 2005年 / 38卷 / 14期
关键词：
D O I：
10.1088/0022-3727/38/14/005
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Recent experimental results (Zheng et al 2004 Science 303 661) have shown that a 1-3-type BaTiO3-CoFe2O4 composite film exhibited a strong coupling between the ferroelectric and ferromagnetic order parameters. The coupling interaction in the nanostructured multiferroic film Could be different from that in a bulk composite because there exists a giant residual stress/strain in the film. In this paper, by considering the influence of the three-dimensional residual strain in the film, the magnetically induced polarization of the nanostructured BaTiO3-CoFe2O4 multiferroic films has been studied using the Landau-Ginsberg-Devonshire thermodynamic theory. The calculation results show that the 1-3-type nanostructured composite film could produce a ferroelectric-ferromagnetic coupling larger than that of its bulk counterpart which is in broad agreement with the experimental results. The 2-2-type nanostructured composite films were found to produce much less coupling interaction in comparison with the 1-3-type film. The dependence of multiferroic coupling on composition and temperature was analysed on the basis of the calculated results.
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页码：2321 / 2326
页数：6
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