期刊
DIAMOND AND RELATED MATERIALS
卷 19, 期 5-6, 页码 553-556出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.diamond.2010.01.031
关键词
MWCNTs; Coercivity; Magnetic recording media
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 similar to 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 (similar to 0.9 Oe) and Fe/Co/Ni nanoparticles or nano-wire arrays (similar to 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. (C) 2010 Elsevier B.V. All rights reserved.
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