Synthesis of planar-graphite structures with embedded Fe_(x)Pd_(x) or COPD-COPD₂ phases and of carbon nanotubes filled with Fe_(x)Pd_(x) with variable filling ratio

FePd and CoPd tetragonal ferromagnetic nanoparticles have recently attracted a great attention due to their large magneto-crystalline anisotropy of ∼10⁸ erg/cm³ ideal for fabrication of magnetic-arrays with giant-coercivities. However, no studies are reported on the fabrication of these alloys inside carbon nanotubes. Here we reveal the synthesis of the FePd₃-Fe_0.037Pd_0.963-Fe₃C inside carbon nanotubes by chemical vapor deposition of large quantities of ferrocene with low quantities of dichloro-cyclooctadiene-palladium and its transformation to Fe_0.438Pd_0.561 through annealing. Instead, planar graphitic structures with embedded FePd₃-Fe_0.037Pd_0.963 or CoPd/CoPd₂ particles are found when large quantities of dichloro-cyclooctadiene-palladium are pyrolyzed with low quantities ferrocene or cobaltocene.