Phase Diagram of BiFeO₃/LaFeO₃ Superlattices: Antiferroelectric‐Like State Stability Arising from Strain Effects and Symmetry Mismatch at Heterointerfaces

Abstract

phase stability to strain effects and rotation/tilt degrees of freedom.

Structural investigation of (111) oriented (BiFeO3)(1-x)Λ/(LaFeO3)xΛ superlattices by X-ray diffraction and Raman spectroscopy

“…These changes suggest a strong change in the Bi atomic displacements and the local structure in the SLs. In a recent work on BFO(1-x)Λ/LFOxΛ SLs grown on (100)MgO substrate, this doublet of modes was observed at 150cm -1 and 181cm -1 for all SLs and was attributed to the change of polar ordering in the BFO layers from ferroelectric to antiferroelectric PbZrO3-like state27 . In our SLs the bands from the STO are large and no information could be gained in the frequency range above 200cm -1 .…”

“…This strategy can also lead to the possibility of creating a chemical-and strain-driven MPB for some composition in comparison to that observed for example in rare earth doped BiFeO3 thin films 9,10 . Several theoretical and experimental studies were done on SLs based on the BiFeO3 coupled with many others oxide materials such as ferroelectric BaTiO3 18,19 ,PbTiO3 20 ,Bi0.5Na0.5TiO3 21 27 . A PbZrO3 antiferroelectric like state was discovered in BFO layers and a peculiar domain state was revealed in these SLs.…”

“…, BiAlO322 , paraelectric SrTiO323,24 and LaFeO3[25][26][27] , multiferroic BiMnO3 28 , antiferromagnetic BiCrO3 29 , magnetic and metallic La0.7Sr0.3MnO330,31 and LaNiO3 32 , ferrimagnetic Fe3O4 6 and superconductingYBa2Cu3O7 33 . However, the majority of the experimental studies concerning the multiferroic thin films and SLs were done on (100)-oriented substrates while a little effort has been concerned on the growth of these nanostructures on (111)-oriented substrates probably due to the polar nature of the atomic layers along [111] direction 34,35 .…”

Anti-polar state in BiFeO3/NdFeO3 superlattices

“…Artificially modulated heterostructures such as superlattices (SLs) are also employed to better understand the competing interactions that exist within the MPB. For instance, BiFeO3/ LaFeO3 (BFO/LFO) SLs deposited on different substrates have been studied by different groups [17][18][19][20][21]. Interestingly, a strain-and symmetry-mismatch-induced stabilization of the AFE-like state was reported in BFO/LFO SLs [18].…”

Interlayer strain effects on the structural behavior of BiFeO3/LaFeO3 superlattices

“…We focus on multilayers of (BiFeO3)0.5 /(LaFeO3)0.5 grown on cubic MgO (100) substrates of about 700 Å total thickness. We have previously shown the possibility to induce an antiferroelectric like state in (BiFeO3)(1-x) /(LaFeO3)x superlattices by varying the ratio, x, of the constituent in the period 9 . We adopt here another approach to investigate the structural coupling between BFO and LFO.…”