Patterning enhanced tetragonality in BiFeO3 thin films with effective negative pressure by helium implantation
| Autor: | Toulouse, Constance, Fischer, J., Farokhipoor, S., Yedra Cardona, Lluís, Carlá, Francesco, Jarnac, A., Elkaim, E., Fertey, P., Audinot, J.-N., Wirtz, Tom, Noheda, B., Garcia, V., Fusil, S., Peral Alonso, I., Guennou, M., Kreisel, J. |
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| Přispěvatelé: | Unité mixte de physique CNRS/Thales (UMPhy CNRS/THALES), Centre National de la Recherche Scientifique (CNRS)-THALES, Nanostructures of Functional Oxides, Solid State Materials for Electronics |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Pel·lícules fines
Condensed Matter - Materials Science Thin films Physics [G04] [Physical chemical mathematical & earth Sciences] Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences Negative pressure Helium BiFeO3 Physique [G04] [Physique chimie mathématiques & sciences de la terre] Heli [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] Strain engineering ComputingMilieux_MISCELLANEOUS |
| Zdroj: | Physical Review Materials Physical Review Materials, American Physical Society, 2021, 5 (2), ⟨10.1103/PHYSREVMATERIALS.5.024404⟩ Physical Review Materials, 5(2):024404. AMER PHYSICAL SOC Dipòsit Digital de la UB Universidad de Barcelona |
| ISSN: | 2475-9953 |
| DOI: | 10.1103/PHYSREVMATERIALS.5.024404⟩ |
| Popis: | Helium implantation in epitaxial thin films is a way to control the out-of-plane deformation independently from the in-plane strain controlled by epitaxy. In particular, implantation by means of a helium microscope allows for local implantation and patterning down to the nanometer resolution, which is of interest for device applications. We present here a study of bismuth ferrite (BiFeO3) films where strain was patterned locally by helium implantation. Our combined Raman, x-ray diffraction, and transmission electron microscopy (TEM) study shows that the implantation causes an elongation of the BiFeO3 unit cell and ultimately a transition towards the so-called supertetragonal polymorph via states with mixed phases. In addition, TEM reveals the onset of amorphization at a threshold dose that does not seem to impede the overall increase in tetragonality. The phase transition from the R-like to T-like BiFeO3 appears as first-order in character, with regions of phase coexistence and abrupt changes in lattice parameters. |
| Databáze: | OpenAIRE |
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