Enhancement of remanent polarization in epitaxial BaTiO3/SrTiO3 superlattices with “asymmetric” structure
作者： Toru Shimuta , Osamu Nakagawara , Takahiro Makino , Seiichi Arai , Hitoshi Tabata
DOI: 10.1063/1.1434547
关键词: Ferroelectric ceramics 、 Ferroelectric thin films 、 Epitaxy 、 Lattice (order) 、 Stacking 、 Superlattice 、 Materials science 、 Condensed matter physics 、 Crystallography 、 Polarization (waves) 、 Lattice constant
摘要: Enhancement of remanent polarization has been demonstrated in epitaxial “asymmetric” BaTiO3/SrTiO3 strained superlattices, which the thickness ratio BaTiO3 to SrTiO3 layers is changed at molecular layer order accuracy. The superlattices have prepared on Nb-doped (100) single-crystal substrates by a pulsed-laser deposition technique. superlattice with stacking periodicity 15 unit cells BaTiO3/3 shows largest 2Pr 46 μC/cm2, about three times that single-phase film formed under same condition. increase attributed both BaTiO3-rich structure and lattice parameter c due mismatch in-plane parameters between SrTiO3.
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