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JOURNAL OF APPLIED PHYSICS
Volume 91, Issue 4, Pages 2290-2294Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1434547
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Enhancement of remanent polarization has been demonstrated in epitaxial asymmetric BaTiO3/SrTiO3 strained superlattices, in which the thickness ratio of BaTiO3 to SrTiO3 layers is changed at molecular layer order accuracy. The superlattices have been prepared on Nb-doped SrTiO3 (100) single-crystal substrates by a pulsed-laser deposition technique. The superlattice with a stacking periodicity of 15 unit cells BaTiO3/3 unit cells SrTiO3 shows the largest remanent polarization 2P(r) of 46 muC/cm(2), which is about three times that of the BaTiO3 single-phase film formed under the same condition. The increase in the remanent polarization is attributed both to the BaTiO3-rich structure and to the increase in lattice parameter c due to the mismatch of in-plane lattice parameters between BaTiO3 and SrTiO3. (C) 2002 American Institute of Physics.
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