title: Artificial design for new ferroelectrics using nanosheet-architectonics concept.
abstract: Control over the emergence of ferroelectric order remains a fundamental challenge for the rational design of artificial materials with novel properties. Here we report a new strategy for artificial design of layered perovskite ferroelectrics by using oxide nanosheets (high-k dielectric Ca2Nb3O10 and insulating Ti0.87O2) as a building block. We approached the preparation of superlattice films by a layer-by-layer assembly involving Langmuir-Blodgett deposition. The artificially fabricated (Ti0.87O2/Ca2Nb3O10)2(Ti0.87O2) superlattices are structurally unique, which is not feasible to create in the bulk form. By such an artificial structuring, we found that (Ti0.87O2/Ca2Nb3O10)2(Ti0.87O2) superlattices possess a new form of interface coupling, which gives rise to ferroelectricity with a good fatigue-free characteristic. Considering the flexibility of self-assembled nanosheet interfaces, this technique provides a route to synthesize a new kind of layered ferroelectric oxides.
authors.affiliation: International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan. Grduate School of Advanced Science and Engineering, Waseda University, Shinjyu-ku, Tokyo 169-8555, Japan.
authors.forename: Yoon-Hyun
authors.initials: YH
authors.lastname: Kim
authors.forename: Lei
authors.initials: L
authors.lastname: Dong
authors.forename: Minoru
authors.initials: M
authors.lastname: Osada
authors.forename: Bao-Wen
authors.initials: BW
authors.lastname: Li
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Ebina
authors.forename: Takayoshi
authors.initials: T
authors.lastname: Sasaki