Adjustable magnetoelectric effect of self-assembled vertical multiferroic nanocomposite films by the in-plane misfit strain and ferromagnetic volume fraction

Journal Article · Fri Mar 21 00:00:00 EDT 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4868896· OSTI ID:22271203

Wu, Huaping ^[1]; Chai, Guozhong; Zhou, Ting; Zhang, Zheng ^[1]; Kitamura, Takayuki ^[2]; Zhou, Haomiao ^[3]

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1. Key Laboratory of E and M (Zhejiang University of Technology), Ministry of Education and Zhejiang Province, Hangzhou 310032 (China)
2. Department of Mechanical Engineering and Science, Kyoto University, Nishikyo-ku, Kyoto 615-8540 (Japan)
3. College of Information Engineering, China Jiliang University, Hangzhou 310018 (China)

The strain-mediated magnetoelectric (ME) property of self-assembled vertical multiferroic nanocomposite films epitaxially grown on cubic substrates was calculated by a nonlinear thermodynamic theory combined with the elastic theory. The dependent relations of phase state of ferroelectric films with the in-plane misfit strain, out-of-plane misfit strain, temperature, and volume fraction of ferromagnetic phase were confirmed. The effects of in-plane misfit strain and ferromagnetic volume fraction on the polarization and dielectric constant of ferroelectric films at room temperature were elaborately analyzed for the vertical BaTiO{sub 3}-CoFe{sub 2}O{sub 4} and PbTiO{sub 3}-CoFe{sub 2}O{sub 4} nanocomposite films. Our calculated results confirmed the relationship among ME effect and in-plane misfit strain and ferromagnetic volume fraction in the nanocomposite films. The ME voltage coefficients of vertical BaTiO{sub 3}-CoFe{sub 2}O{sub 4} and PbTiO{sub 3}-CoFe{sub 2}O{sub 4} nanocomposite films displayed various maximums and abrupt points at special phases and phase transition boundaries. The ME voltage coefficients of lead-free BaTiO{sub 3}-CoFe{sub 2}O{sub 4} nanocomposite films epitaxially grown on different substrates could reach a comparative value of ∼2 V·cm{sup −1}·Oe{sup −1} under the controllable in-plane misfit strain induced by substrate clamping. Our results provided an available method for the optimal design of vertical multiferroic nanocomposites with adjustable ME effect by optimizing the ferromagnetic volume fraction and substrate type.

• OSTI ID: 22271203
• Journal Information: Journal of Applied Physics, Vol. 115, Issue 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
77 NANOSCIENCE AND NANOTECHNOLOGY
BARIUM COMPOUNDS
COBALT OXIDES
COMPOSITE MATERIALS
EPITAXY
FERROELECTRIC MATERIALS
LEAD COMPOUNDS
MAGNETIC PROPERTIES
NANOSTRUCTURES
NONLINEAR PROBLEMS
PERMITTIVITY
PHASE TRANSFORMATIONS
POLARIZATION
STRAINS
SUBSTRATES
TEMPERATURE RANGE 0273-0400 K
THIN FILMS
TITANATES