Magnetic behavior of iron-filled multiwalled carbon nanotubes

Karmakar, S. ; Sharma, Surinder M. ; Mukadam, M. D. ; Yusuf, S. M. ; Sood, A. K. (2005) Magnetic behavior of iron-filled multiwalled carbon nanotubes Journal of Applied Physics, 97 (5). 054306_1- 054306_5. ISSN 0021-8979

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Using vibrating-sample magnetometry, magnetic properties of iron-filled multiwalled carbon nanotubes have been investigated. The field dependence of dc magnetization at high magnetic fields suggests that these tubes behave as a one-dimensional exchange-coupled ferromagnetic system. At 5 K, the saturation magnetization (MS) of the nanowires is found to be 85 emu/g, which is much less than the expected bulk value ~210 emu/g. The observed exchange bias, in spite of the small fraction of γ-Fe in our samples, implies that γ-Fe may not be the only antiferromagnetic component responsible for the exchange bias in these Fe-filled carbon nanotubes. Quantitative study on the temperature dependence of saturation magnetization, remanent magnetization and coercivity has been carried out.

Item Type:Article
Source:Copyright of this article belongs to American Institute of Physics.
Keywords:Iron Compounds; Carbon Nanotubes; Ferromagnetic Materials; Antiferromagnetic Materials; Nanowires; Exchange Interactions (Electron); Coercive Force; Remanence; Magnetic Hysteresis; Magnetic Anisotropy
ID Code:48145
Deposited On:13 Jul 2011 14:27
Last Modified:04 Oct 2011 13:47

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