High coercivity magnetic multi-wall carbon nanotubes for low-dimensional high-density magnetic recording media |
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Authors: | SC Ray S Bhattacharyya SL Wu DC Ling WF Pong M Giorcelli S Bianco A Tagliaferro |
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Affiliation: | 1. School of Physics, University of the Witwatersrand, Private Bag 3, WITS 2050, Johannesburg, South Africa;2. Department of Physics, Tamkang University, Tamsui 251, Taiwan;3. Department of Material Science and Chemical Engineering, Politecnico di Torino, Torino 10129, Italy |
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Abstract: | Fe-embedded multi-wall carbon nanotubes (MWCNTs) were fabricated using Fe-catalyst by the chemical deposition method. Microscopic characterizations showed that the well-aligned MWCNTs were ~ 80 mm in length, with outer diameter of 20–50 nm and inner diameter of 10–20 nm. Magnetic properties were characterized in temperatures of 5 K and 305 K, which revealed that the MWCNTs exhibited high coercivity of 2600 Oe at 5 K and 732 Oe at 305 K. These values are much higher than that of bulk iron (~ 0.9 Oe) and Fe/Co/Ni nanoparticles or nano-wire arrays (~ 200–500 Oe) at the room temperature. This high coercivity and the structure of single-domain Fe nanoparticles isolated by anti-ferromagnetic MWCNTs make it a promising candidate for low-dimensional high-density magnetic recording media. |
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