Reference : Low energy electron imaging of domains and domain walls in magnesium-doped lithium niobate
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
Physics and Materials Science
Low energy electron imaging of domains and domain walls in magnesium-doped lithium niobate
Nataf, G. F. [> >]
Grysan, P. [> >]
Guennou, Mael mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit]
Kreisel, Jens mailto [University of Luxembourg > Rectorate >]
Martinotti, D. [> >]
Rountree, C. L. [> >]
Mathieu, C. [> >]
Barrett, N. [> >]
2045-2322 Nataf, Guillaume F./J-2175-2019 Mathieu, Claire/N-5130-2014 Rountree, Cindy Lynn/D-5430-2015 Nataf, Guillaume F./0000-0001-9215-4717 Rountree, Cindy Lynn/0000-0003-4349-7064 ISI:000382744000001
[en] The understanding of domain structures, specifically domain walls currently attracts a significant attention in the field of (multi)-ferroic materials. In this article, we analyze contrast formation in full field electron microscopy applied to domains and domain walls in the uniaxial ferroelectric lithium niobate, which presents a large 3.8 eV band gap and for which conductive domain walls have been reported. We show that the transition from Mirror Electron Microscopy (MEM - electrons reflected) to Low Energy Electron Microscopy (LEEM - electrons backscattered) gives rise to a robust contrast between domains with upwards (P-up) and downwards (P-down) polarization, and provides a measure of the difference in surface potential between the domains. We demonstrate that out-of-focus conditions of imaging produce contrast inversion, due to image distortion induced by charged surfaces and also carry information on the polarization direction in the domains. Finally, we show that the intensity profile at domain walls provides experimental evidence for a local stray, lateral electric field.

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