Nanomagnetic – metallic Nanoparticles Filled Carbon Nanotubes

Report No. ARL-TR-5957
Authors: Dereje Seifu, Govind Mallick, and Shashi P. Karna
Date/Pages: March 2012; 24 pages
Abstract: The high demand for nanoelectronics devices, high density magnetic memories, sensors, and energy storage for the future force and warfighters have led us to develop unique methods to fill vertically aligned nanofibers with magnetic nanoparticles such as cobalt ferrite (CoFe2O4), iron (Fe), and nickel cobalt (NiCo). In this work, pulsed laser deposition (PLD) is used to fill CoFe2O4 and DC magnetron sputtering is used to fill Fe and NiCo in carbon nanotubes (CNTs). The filled CNTs are characterized by scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS), atomic force microscopy (AFM), magnetic force microscopy (MFM), and vibrating sample magnetometer (VSM). Magnetization measurements in-plane and out-of-plane with respect to the sample's surface of CNTs filled with CoFe2O4 indicates a reasonable coercivity of 0.4 T. The magnetic anisotropy is, however, found out to be randomly oriented indicating a polycrystalline structure. The unique difference between the in-plane and out-of-plane magnetizations is the sharing produced by the demagnetizing field in the perpendicular direction.
Distribution: Approved for public release
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Last Update / Reviewed: March 1, 2012