Journal
APPLIED SURFACE SCIENCE
Volume 392, Issue -, Pages 715-722Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2016.09.103
Keywords
Graphene; Intercalation; Iron silicides; Photoelectron spectroscopy; Ferromagnetic materials; Thin films
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Funding
- Russian German laboratory at BESSY II of HZB in Berlin, Germany
- Resource Center Physical methods of surface investigation of Research Park of Saint Petersburg State University, Russia [S-RC-5/4]
- Russian Foundation for Basic Research [16-02-00387]
- Saint Petersburg State University [15.61.202.2015]
- ITMO University
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A new method for synthesis of graphene-protected iron silicides has been tested, which consists in formation of graphene on Ni(111) followed by two-step intercalation of the system with Fe and Si. Characterization of the samples was performed in situ by low-energy electron diffraction, angular-resolved photoelectron spectroscopy, core-level photoelectron spectroscopy with synchrotron radiation and magnetic linear dichroism in photoemission of Fe 3p electrons. It is shown, that at 400 degrees C the intercalation of graphene/Ni(111) with iron occurs in a range up to 14 ML. The graphene layer strongly interacts with the topmost Fe atoms and stabilizes the fcc structure of the film. The in-plane ferromagnetic ordering of the film has a threshold nature and arises after the intercalation of 5 ML Fe due to the thickness-driven spin reorientation transition. Subsequent intercalation of graphene/Fe/Ni(111) with Si leads to the formation of the inhomogeneous system consisted of intercalated and nonintercalated areas. The intercalated islands coalesce at 2 ML Si when a Fe-Si solid solution covered with the Fe3Si surface silicide is formed. The Fe3Si silicide is ferromagnetic and has an ordered (root 3 x root 3)R30 degrees structure. The graphene layer is weakly electronically coupled to the silicide phase keeping its remarkable properties ready for use. (C) 2016 Elsevier B.V. All rights reserved.
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