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Title

Magnetism of Cr10 wheels on Au(111) and Cu(111) surfaces

AuthorsBartolomé, Elena ; Ferrari, Ludovica; Ferrari, Ludovica; Herrero-Albillos, Julia; Panighel, Mirko ; Arauzo, Ana B.; Mugarza, Aitor ; Sambi, Mauro; Bartolomé, Juan; Herrero Martín, Javier ; Bartolomé, Fernando
Issue Date2018
CitationXGEFES 2018
AbstractWe report on the magnetic properties of {Cr10} wheels (Cr10(OMe)20(O2CCMe)10) UHVsublimated on Cu(111) and Au(111) single-crystals investigated by means of by XAS & XMCD, SQUID magnetometry and STM. We discuss the magnetic anisotropy and magnetic moment field-dependence of the grafted {Cr10} molecules, as a function of the metallic substrate and layer thickness, and compare it with bulk material. Our results demonstrate that evaporated molecules show negligible anisotropy and weak dependence with the substrate. A combination of XMCD and SQUID magnetometry show that Mono- and Multilayer {Cr10} samples exhibit a magnetic behavior stemming from a S = 9 ground state, ruling out some previous results. Montecarlo simulations show that the magnetic evolution can be explained by {Cr10} molecules magneticaly consisting of two semi-crowns containing 4 Cr ions interacting ferromagnetically, separated by 2 Cr ions with antiferromagnetic interactions, giving rise to the ground S = 9 state, in agreement with previous EPR data in literature. Evaporation of {Cr10} onto a substrate producing subtle structural changes induce strong changes in the Cr-Cr interactions and distinct magnetic behavior from the bulk.
DescriptionTrabajo presentado al X Meeting de GEFES (División de Física de la Materia Condensada de la Real Sociedad Española de Física), celebrado en Valencia del 24 al 26 de enero de 2018
URIhttp://hdl.handle.net/10261/183348
Appears in Collections:(CIN2) Comunicaciones congresos
(ICMA) Comunicaciones congresos
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