High coercivity magnetic multi-wall carbon nanotubes for low-dimensional high-density magnetic recording media

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Title:	High coercivity magnetic multi-wall carbon nanotubes for low-dimensional high-density magnetic recording media
Authors:	Ray, S.C.;Bhattacharyya, S.;Wu, S.L.;Ling, D.C.;Pong, W.F.;Giorcelli, M;Bianco, S.;Tagliaferro, A.
Contributors:	淡江大學物理學系
Keywords:	MWCNTs;Coercivity;Magnetic recording media
Date:	2010-05
Issue Date:	2012-06-14 09:24:53 (UTC+8)
Publisher:	Lausanne: Elsevier S.A.
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.
Relation:	Diamond and Related Materials 19(5-6), pp.553-556
DOI:	10.1016/j.diamond.2010.01.031
Appears in Collections:	[Graduate Institute & Department of Physics] Journal Article

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