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Structural phases and Fe magnetic moment upon oxidation of Fe-Phtalocyanine monolayers on Ag(110)

AuthorsBartolomé, Fernando; Bartolomé, Elena ; Hernández-López, Leyre; Lobo-Checa, Jorge ; Sedona, Francesco; Piantek, Marten; Herrero-Albillos, Julia; García, L. M.; Panighel, Mirko ; Mugarza, Aitor ; Herrero Martín, Javier ; Serrate, David; Bartolomé, Juan; Sambi, Mauro
Issue Date2018
Citation21st International Conference on Magnetism (2018)
AbstractMolecular overlayers on ordered substrates have a broad field of application in catalysis, sensing, molecular electronics, etc. Recent studies of FePc on Ag(110) have shown that sub-monolayer phases are catalitically active: in oxygen-dosed phases, O2 intercalates between the molecules and the surface, substantially changing the Fe magnetic moment. Reversible switching of this moment in low-density FePc phases upon an oxygenation - annealing cycle has been demonstrated. A continuous FePc monolayer on Ag(110) displays several phases, with different FePc density as a function of the molecular coverage. At low coverage, two degenerate but structurally distinct low-density superstructures simultaneously appear after a ~ 450 K annealing, namely a c(10×4)- and a p(10×4)-phase. At higher coverages, a denser oblique phase O(1±4,4-+3) is stablished after annealing. At even higher coverage, denser phases do form, namely a “quasi-square” phase (R3) and a square phase (SQ). The different FePc phases have been oxygen-dosed (10-100 L). Remarkably, in oxygen-dosed phases O2 dissociates and intercalates between the molecules and the surface substantially changing the Fe magnetic moment. X-ray absorption combined with STM images allow us to determine the effectivity of the oxygenation procedure, as a function of the 2D structural phase, and to correlate it with the average magnetic moment as measured by XMCD at the Fe L2,3–edges. Sum rule analysis yield the spin and orbital magnetic moments for each sample. It is concluded that all characterised phases display planar anisotropy, and the values of mseff are about one order of magnitude larger than mL in clear contrast to the FePc molecule in bulk or in multilayer, wich shows a much larger orbital moment. Our work shows how oxidation and therefore magnetic moment switching depends on the steric facility for the molecules to form the Ag(110)-Oxygen-FePc ensemble, which is geometrically hampered in high density phases.
DescriptionResumen del trabajo presentado a la 21st International Conference on Magnetism (ICM), celebrada en San Francisco (US) del 15 al 20 de julio de 2018.
Appears in Collections:(CIN2) Comunicaciones congresos
(ICMA) Comunicaciones congresos
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