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Tunable ferroelectricity in artificial tri-layer superlattices comprised of non-ferroic components.

Abstract：

:Heterostructured material systems devoid of ferroic components are presumed not to display ordering associated with ferroelectricity. In heterostructures composed of transition metal oxides, however, the disruption introduced by an interface can affect the balance of the competing interactions among electronic spins, charges and orbitals. This has led to the emergence of properties absent in the original building blocks of a heterostructure, including metallicity, magnetism and superconductivity. Here we report the discovery of ferroelectricity in artificial tri-layer superlattices consisting solely of non-ferroelectric NdMnO(3)/SrMnO(3)/LaMnO(3) layers. Ferroelectricity was observed below 40 K exhibiting strong tunability by superlattice periodicity. Furthermore, magnetoelectric coupling resulted in 150% magnetic modulation of the polarization. Density functional calculations indicate that broken space inversion symmetry and mixed valency, because of cationic asymmetry and interfacial polar discontinuity, respectively, give rise to the observed behaviour. Our results demonstrate the engineering of asymmetric layered structures with emergent ferroelectric and magnetic field tunable functions distinct from that of normal devices, for which the components are typically ferroelectrics.

journal_name

Nat Commun

journal_title

Nature communications

authors

Rogdakis K,Seo JW,Viskadourakis Z,Wang Y,Qune LF,Choi E,Burton JD,Tsymbal EY,Lee J,Panagopoulos C

doi

10.1038/ncomms2061

subject

Has Abstract

pub_date

2012-01-01 00:00:00

pages

1064

issn

2041-1723

pii

ncomms2061

journal_volume

3

pub_type

杂志文章

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