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

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 optimizingmore » the ferromagnetic volume fraction and substrate type.« less
Authors:
 [1] ;  [2] ; ; ;  [1] ;  [3] ;  [4]
  1. Key Laboratory of E and M (Zhejiang University of Technology), Ministry of Education and Zhejiang Province, Hangzhou 310032 (China)
  2. (Japan)
  3. Department of Mechanical Engineering and Science, Kyoto University, Nishikyo-ku, Kyoto 615-8540 (Japan)
  4. College of Information Engineering, China Jiliang University, Hangzhou 310018 (China)
Publication Date:
OSTI Identifier:
22271203
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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