2D nature of magnetic states at SnO2 surfaces: a combined experimental and theoretical study

0585497 - ÚFM 2025 RIV GB eng J - Článek v odborném periodiku
Hong, N. H. - Friák, Martin - Pazourek, P. - Pham, N. S. - Nhu, T. Q. - Kiaba, M. - Gazdová, K. - Pavlů, J.
2D nature of magnetic states at SnO2 surfaces: a combined experimental and theoretical study.
RSC Advances. Roč. 14, č. 19 (2024), s. 13583-13590. E-ISSN 2046-2069
Výzkumná infrastruktura: CzechNanoLab - 90110
Institucionální podpora: RVO:68081723
Klíčová slova: magnetism * surfaces * thin films
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 3.9, rok: 2022
Způsob publikování: Omezený přístup
https://pubs.rsc.org/en/content/articlelanding/2024/ra/d4ra00734d

For undoped SnO2, room temperature ferromagnetism could be seen uniquely in 2-dimensional configurations, particularly in ultra-thin films (whose thickness is ideally below 100 nm). Both bulk samples and nano-powders of pristine SnO2 are diamagnetic, indicating that a 2D surface is a key point in shaping up the magnetic properties in SnO2. As a complement to our experiments, we have performed a series of quantum-mechanical calculations for the bulk rutile-structure SnO2 as well as its (001) and (101) surfaces. The calculations included several atomic configurations with and without vacancies in/under the studied surfaces. The stability of the non-magnetic ground state of rutile SnO2 bulk was cross-checked and confirmed by its phonon spectrum computed within the harmonic approximation. Regarding the surfaces, the bulk-like (001) surface containing Sn vacancies has turned out to be ferromagnetic, while the shift of Sn vacancies under the surface resulted in a more complex ferrimagnetic state. The bulk-like (001) surface without vacancies and that with the O vacancies are predicted to be non-magnetic. Regarding the (101) surfaces, those terminated by a single layer of oxygen atoms and those terminated by tin atoms are non-magnetic, while a surface terminated by two layers of oxygen has turned out to be ferromagnetic.


Trvalý link: https://hdl.handle.net/11104/0353186