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dc.contributor.authorCebollada, Alfonso-
dc.contributor.authorGarcía-Martín, José Miguel-
dc.contributor.authorClavero Pérez, César-
dc.contributor.authorBalcells Argemi, Lluis-
dc.contributor.authorEstradé, J.-
dc.contributor.authorArbiol, J.-
dc.contributor.authorPeiró, F.-
dc.contributor.authorSmith, C.-
dc.contributor.authorClarke, Roy-
dc.contributor.authorMartínez Rodríguez, Luis Javier-
dc.contributor.authorHuttel, Yves-
dc.contributor.authorRomán, Eduardo H.-
dc.contributor.authorTelling, N. D.-
dc.contributor.authorVan der Laan, G.-
dc.identifier.citationPhysical Review B.79.014414en_US
dc.description.abstractWe present a detailed study on the morphology and magnetic properties of Co nanostructures deposited onto oxidized Si substrates by femtosecond pulsed laser deposition. Generally, Co disks of nanometric dimensions are obtained just above the ablation threshold, with a size distribution characterized by an increasingly larger number of disks as their size diminishes, and with a maximum disk size that depends on the laser power density. In Au/Co/Au structures, in-plane magnetic anisotropy is observed in all cases, with no indication of superparamagnetism regardless of the amount of material or the laser power density. Magnetic force microscopy observations show coexistence of single-domain and vortex states for the magnetic domain structure of the disks. Superconducting quantum interference device magnetometry and x-ray magnetic circular dichroism measurements point to saturation magnetization values lower than the bulk, probably due to partial oxidation of the Co resulting from incomplete coverage by the Au capping layer.en_US
dc.description.sponsorshipWork was supported in part by the U.S. Department of Energy, Basic Energy Sciences (Grant No. DE-FG02-06ER46273), NSF FOCUS Center, the Spanish Ministerio de Educación y Ciencia (References No. PR2005-0017 and No.MAT2005-05524-C02), Comunidad de Madrid (Reference No. S-0505/MAT/0194 NANOMAGNET), and CSIC (Reference No. 200650I130). Support from the SRS staff during the XMCD experiments is greatly acknowledged. Y.H. and L.M. also acknowledge financial support from the “Ramón y Cajal” and “Juan de la Cierva” programs, respectively, from the Spanish Ministerio de Investigación y Ciencia and Consejo Superior de Investigaciones Científicas (CSIC).en_US
dc.format.extent944277 bytes-
dc.publisherAmerican Physical Societyen_US
dc.subjectmagnetic circular dichroismen_US
dc.subjectMagnetic domainsen_US
dc.subjectMagnetic force microscopyen_US
dc.subjectNanostructured materialsen_US
dc.subjectPulsed laser depositionen_US
dc.subjectSurface structureen_US
dc.titleGrowth and magnetic characterization of Co nanoparticles obtained by femtosecond pulsed laser depositionen_US
dc.description.peerreviewedPeer revieweden_US
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