Universität zu Köln

Grebenyuk, G. S., Vilkov, O. Yu., Rybkin, A. G., Gomoyunova, M. V., Senkovskiy, B. V., Usachov, D. Yu., Vyalikh, D. V., Molodtsov, S. L. and Pronin, I. I. (2017). Intercalation synthesis of graphene-capped iron silicide atop Ni(111): Evolution of electronic structure and ferromagnetic ordering. Appl. Surf. Sci., 392. S. 715 - 723. AMSTERDAM: ELSEVIER SCIENCE BV. ISSN 1873-5584

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Abstract

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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Grebenyuk, G. S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Vilkov, O. Yu. UNSPECIFIED UNSPECIFIED UNSPECIFIED Rybkin, A. G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gomoyunova, M. V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Senkovskiy, B. V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Usachov, D. Yu. UNSPECIFIED UNSPECIFIED UNSPECIFIED Vyalikh, D. V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Molodtsov, S. L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pronin, I. I. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-242491
DOI:	10.1016/j.apsusc.2016.09.103
Journal or Publication Title:	Appl. Surf. Sci.
Volume:	392
Page Range:	S. 715 - 723
Date:	2017
Publisher:	ELSEVIER SCIENCE BV
Place of Publication:	AMSTERDAM
ISSN:	1873-5584
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language POLARIZED SYNCHROTRON-RADIATION; CHEMICAL-VAPOR-DEPOSITION; 3P CORE-LEVEL; LINEAR DICHROISM; COBALT SILICIDE; METAL-SURFACES; PHOTOEMISSION; FILMS; FE; MONOLAYER Multiple languages Chemistry, Physical; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/24249