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Capping layer effects in the structure and composition of Co nanoparticle ultrathin films

AuthorsArbiol, J.; Peiró, F.; Cornet, A.; Clavero Pérez, César ; Cebollada, Alfonso ; Armelles Reig, Gaspar ; Huttel, Yves
magnetic particles
ferromagnetic materials
aluminium compounds
magnesium compounds
magnetic thin films
metallic thin films
insulating thin films
transmission electron microscopy
Issue Date12-Jan-2005
PublisherAmerican Institute of Physics
CitationApplied Physic Letters 86, 032510 (2005)
AbstractIn this work, we present the correlation of the magnetic and structural properties of Co nanoparticles deposited by sputtering on Si3N4 substrates at different temperatures, and covered with different capping layers, two insulators, AlN and MgO, and a metal, Pt. High-resolution transmission electron microscopy shows the formation of CoPt3 and Co2N, for the Pt and AlN capping layers, respectively, giving to a significant change of the magnetic behavior. When using a cap of MgO, energy-filtered transmission electron microscopy shows an oxidized shell covering the Co nanoparticles with thickness decreasing as the deposition temperature increases, explaining the changes in the magnetic response induced by the MgO capping layer.
Publisher version (URL)http://link.aip.org/link/?APPLAB/86/032510/1
Appears in Collections:(IMN-CNM) Artículos
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