Article (Scientific journals)
Patterning enhanced tetragonality in BiFeO3 thin films with effective negative pressure by helium implantation
TOULOUSE, Constance; Fischer, Johanna; Farokhipoor, Saeedeh et al.
2021In Physical Review Materials, 5 (2), p. 024404
Peer reviewed
 

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Keywords :
Negative pressure; BiFeO3; Strain engineering
Abstract :
[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.
Disciplines :
Physics
Author, co-author :
TOULOUSE, Constance ;  University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)
Fischer, Johanna
Farokhipoor, Saeedeh
Yedra, Lluis
Carlà, Francesco
Jarnac, Amélie
Elkaim, Erik
Fertey, Pierre
AUDINOT, Jean-Nicolas ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC)
WIRTZ, Tom ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC)
Noheda, Beatriz
Garcia, Vincent
Fusil, Stéphane
PERAL ALONSO, Inmaculada ;  University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > FSTM Faculty administration
GUENNOU, Mael  ;  University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)
KREISEL, Jens ;  University of Luxembourg > CRC > Vice-rectorate for Research (VR Research)
More authors (6 more) Less
External co-authors :
yes
Language :
English
Title :
Patterning enhanced tetragonality in BiFeO3 thin films with effective negative pressure by helium implantation
Publication date :
2021
Journal title :
Physical Review Materials
Volume :
5
Issue :
2
Pages :
024404
Peer reviewed :
Peer reviewed
Focus Area :
Physics and Materials Science
Commentary :
Publisher: American Physical Society
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since 10 February 2022

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