The magnetic properties of iron nanoparticles partially encapsulated at the
tips of aligned carbon nanotubes have been studied. The carbon nanotube wa
ll not only protects the metallic particles from oxidization, but also redu
ces the inter-particle dipolar interaction by non-magnetic separation. Magn
etic characterizations performed in the temperature range of 5-350K with ma
gnetic field up to 3T show that these carbon-nanotube-supported iron partic
les are good candidates for high-density magnetic recording media. (C) 2001
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