Observation of ferromagnetism in PdCo alloy nanoparticles encapsulated in carbon nanotubes

Roa, Daniel Bretas; Barcelos, Ingrid David; de Siervo, Abner; Pirota, Kleber Roberto; Lacerda, Rodrigo Gribel; Magalhães-Paniago, Roério
June 2010
Applied Physics Letters;6/21/2010, Vol. 96 Issue 25, p253114
Academic Journal
Carbon nanotubes terminated by PdCo catalyst nanoparticles were grown by plasma-enhanced chemical vapor deposition. Transmission electron microscopy reveals that these nanoparticles have a droplike shape and are completely encapsulated inside multiwalled nanotubes. Magnetization measurements showed the existence of a permanent magnetization with a small shape anisotropy effect. The magnetization of both cobalt and palladium was confirmed by x-ray magnetic circular dichroism. These results show that nanotubes ended by magnetic PdCo nanoparticles can be grown and could be used in magnetic storage media and electrical spin injection.


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