The unique combination of electronic and mechanical properties of carbon nanotubes (CNT), the possibility of using as novel materials for a variety of applications includes field emission lamps, nanotransistors, spin polarized electron sources, flat display panels, and hydrogen storing system to make them the object of intensive studies [l].The encapsulation of magnetic phases in carbon nanotubes provide both an appreciable magnetic and mechanical stability and an effective protection of the ferromagnetic fillings against oxidation. The control of the coactivity of these magnetic phase filled nanotubes would make possible their use as very high density recording media, as magnetoresistive, elements suitable to be packed to high densities, as probes for magnetic force microscopy, and, even, as recording heads.[2-3]. Metal-filled and, in particular, iron-filled multiwalled CNTs can be synthesized by chemical vapor deposition [4],by arc discharge, electrodeposition or electrolysis [5] and the properties , magnetic in particular, are strtmgly depends on methods of synthesis [6]. In this work we present the results of investigation of magnetic properties of MWNT obtained by the method of the catalytic decomposition of benzene and ferrocene with high concentrations of ferrocene.
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