Reference : Patterning enhanced tetragonality in BiFeO3 thin films with effective negative pressu...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
Physics and Materials Science
http://hdl.handle.net/10993/50242
Patterning enhanced tetragonality in BiFeO3 thin films with effective negative pressure by helium implantation
English
Toulouse, Constance mailto [University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)]
Fischer, Johanna mailto [> >]
Farokhipoor, Saeedeh mailto [> >]
Yedra, Lluis mailto [> >]
Carlà, Francesco mailto [> >]
Jarnac, Amélie mailto [> >]
Elkaim, Erik mailto [> >]
Fertey, Pierre mailto [> >]
Audinot, Jean-Nicolas mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) >]
Wirtz, Tom mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) >]
Noheda, Beatriz mailto [> >]
Garcia, Vincent mailto [> >]
Fusil, Stéphane mailto [> >]
Peral Alonso, Inmaculada mailto [University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > FSTM Faculty administration >]
Guennou, Mael mailto [University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)]
Kreisel, Jens mailto [University of Luxembourg > CRC > Vice-rectorate for Research (VR Research)]
2021
Physical Review Materials
5
2
024404
Yes
International
[en] Negative pressure ; BiFeO3 ; Strain engineering
[en] 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.
http://hdl.handle.net/10993/50242
10.1103/PhysRevMaterials.5.024404
https://link.aps.org/doi/10.1103/PhysRevMaterials.5.024404
Publisher: American Physical Society

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