Low energy electron imaging of domains and domain walls in magnesium-doped lithium niobate

G. F. Nataf 1 P. Grysan 2 M. Guennou 2, 3 J. Kreisel 3, 2 D. Martinotti 4 C. Rountree 5 C. Mathieu 1 N. Barrett 1
1 LENSIS - Laboratoire d'Etude des NanoStructures et Imagerie de Surface
SPEC - UMR3680 - Service de physique de l'état condensé, IRAMIS - Institut Rayonnement Matière de Saclay
4 LEPO - Laboratoire d'Electronique et nanoPhotonique Organique
SPEC - UMR3680 - Service de physique de l'état condensé, IRAMIS - Institut Rayonnement Matière de Saclay
5 SPHYNX - Systèmes Physiques Hors-équilibre, hYdrodynamique, éNergie et compleXes
SPEC - UMR3680 - Service de physique de l'état condensé, IRAMIS - Institut Rayonnement Matière de Saclay
Abstract : 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 (Pup) and downwards (Pdown) 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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Article dans une revue
Scientific Reports, Nature Publishing Group, 2016, 6, 〈10.1038/srep33098〉
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Soumis le : jeudi 2 mars 2017 - 16:21:10
Dernière modification le : jeudi 15 mars 2018 - 15:05:28

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G. F. Nataf, P. Grysan, M. Guennou, J. Kreisel, D. Martinotti, et al.. Low energy electron imaging of domains and domain walls in magnesium-doped lithium niobate. Scientific Reports, Nature Publishing Group, 2016, 6, 〈10.1038/srep33098〉. 〈cea-01481473〉

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