Mechanisms of surface nanostructuring of Al.sub.2./sub.O.sub.3./sub. and MgO by grazing incidence irradiation with swift heavy ions

0561938 - FZÚ 2023 RIV NL eng J - Journal Article
Karlusic, M. - Rymzhanov, R. A. - O'Connell, J. H. - Brockers, L. - Luketic, K.T. - Siketić, Z. - Fazinic, S. - Dubček, P. - Jakšic, M. - Provatas, G. - Medvedev, Nikita - Volkov, A.E. - Schleberger, M.
Mechanisms of surface nanostructuring of Al₂O₃ and MgO by grazing incidence irradiation with swift heavy ions.
Surfaces and Interfaces. Roč. 27, Dec (2021), č. článku 101508. ISSN 2468-0230. E-ISSN 2468-0230
R&D Projects: GA MŠMT LTT17015
EU Projects: European Commission(XE) 654148 - LASERLAB-EUROPE
Institutional support: RVO:68378271
Keywords : ion irradiation * irradiation effects * swift heavy ion * atomic force microscopy * Md simulation
OECD category: Fluids and plasma physics (including surface physics)
Impact factor: 6.137, year: 2021
Method of publishing: Limited access
https://doi.org/10.1016/j.surfin.2021.101508

We experimentally discovered that Al2O3 and MgO exhibit well-pronounced nanometric modifications on the surfaces when irradiated under grazing incidence with 23 MeV I beam, in contrast to normal incidence irradiation with the same ion beam when no damage was found. Moreover, ions in these two materials produce notably different structures: grooves surrounded with nanohillocks on MgO surfaces vs. smoother, roll-like discontinuous structures on the surfaces of Al2O3. To explain these results, detailed numerical simulations were performed. We identified that a presence of the surface inhibits recrystallization process, thereby preventing transient tracks from recovery, and thus forming observable nanopatterns. Furthermore, a difference in the viscosities in molten states in Al2O3 vs. MgO explains the differences in the created nanostructures. Our results thus provide a deeper understanding of the fundamental processes of surface nanostructuring.

Permanent Link: https://hdl.handle.net/11104/0334367