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Issue 9, 2016
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Unconventional properties of nanometric FeO(111) films on Ru(0001): stoichiometry and surface structure

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Abstract

We report on the growth of high quality monocrystalline and stoichiometric FeO(111) films on Ru(0001) by infrared pulsed laser deposition (IR-PLD), in a thickness range from below 1 nm to above 8 nm. The films are characterized by low-energy electron diffraction (LEED), X-ray photoelectron spectroscopy (XPS) and ion scattering spectroscopy (ISS). Besides the 1 : 1 Fe/O ratio, they show some unexpected properties, such as the lack of Fe3+ sites at the surface, the (1 × 1) surface symmetry and the large lattice expansion. First-principles calculations show that these properties can be understood from the existence of a wurtzite-like environment at the surface region that preserves the bulk-like antiferromagnetism. This extends the validity of stacking-faults as efficient mechanisms to compensate surface polarity, and suggests that surface-induced processes can be tailored to design nanoscaled materials beyond the parent bulk phase diagram.

Graphical abstract: Unconventional properties of nanometric FeO(111) films on Ru(0001): stoichiometry and surface structure

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Publication details

The article was received on 19 Nov 2015, accepted on 25 Jan 2016 and first published on 28 Jan 2016


Article type: Paper
DOI: 10.1039/C5TC03871E
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J. Mater. Chem. C, 2016,4, 1850-1859

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    Unconventional properties of nanometric FeO(111) films on Ru(0001): stoichiometry and surface structure

    L. Martín-García, I. Bernal-Villamil, M. Oujja, E. Carrasco, R. Gargallo-Caballero, M. Castillejo, J. F. Marco, S. Gallego and J. de la Figuera, J. Mater. Chem. C, 2016, 4, 1850
    DOI: 10.1039/C5TC03871E

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