High surface stability of magnetite on bi-layer Fe3O4/Fe/MgO(0 0 1) films under 1 MeV Kr+ ion irradiation

0482850 - ÚJF 2018 RIV VN eng J - Článek v odborném periodiku
Kim-Ngan, N.-T.H. - Krupska, M. - Balogh, A. G. - Malinský, Petr - Macková, Anna
High surface stability of magnetite on bi-layer Fe3O4/Fe/MgO(0 0 1) films under 1 MeV Kr+ ion irradiation.
Advances in Natural Sciences: Nanoscience and Nanotechnology. Roč. 8, č. 4 (2017), č. článku 045005. E-ISSN 2043-6262
Grant CEP: GA MŠMT LM2015056
Institucionální podpora: RVO:61389005
Klíčová slova: nanoscience * thin film * surface and interface
Obor OECD: Nuclear physics
Impakt faktor: 1.581, rok: 2015

We investigate the stability of the bi-layer Fe3O4/Fe(0 0 1) films grown epitaxially on MgO(0 0 1) substrates with the layer thickness in the range of 25-100 nm upon 1 MeV Kr+ ion irradiation. The layer structure and layer composition of the films before and after ion irradiation were studied by XRR, RBS and RBS-C techniques. The interdiffusion and intermixing was analyzed. No visible change in the RBS spectra was observed upon irradiation with ion fluence below 10(15) Kr cm-2. The bi-layer structure and the stoichiometric Fe3O4 layer on the surface were well preserved after Kr+ ion irradiation at low damage levels, although the strong intermixing implied a large interfacial (FexOy) and (Fe, Mg)Oy layer respective at Fe3O4-Fe and Fe-MgO interface. The high ion fluence of 3.8 × 10(16) Kr cm-2 has induced a complete oxidization of the buffer Fe layer. Under such Kr fluence, the stoichiometry of the Fe3O4 surface layer was still preserved indicating its high stability. The entire film contains FexOy -type composition at ion fluence large than 5.0 × 10(16) Kr cm-2.
Trvalý link: http://hdl.handle.net/11104/0278537