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Magnetic Properties of Iron Particles Embedded in Multiwall Carbon Nanotubes

Arya, Ved Prakash and Prasad, V and Kumar, PS Anil (2009) Magnetic Properties of Iron Particles Embedded in Multiwall Carbon Nanotubes. In: International Conference on Nanoscience and Technology, FEB 27-29, 2008, Chennai, India, pp. 5406-5410.

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Iron nanoparticles are embedded in multiwall carbon nanotubes by the chemical vapor deposition, where benzene and ferrocene are taken as precursor materials. Varying quantity of iron particles are embedded in these tubes by taking different amount of ferrocene. These particles exhibit a magnetic moment up to 98 emu/g and an enhanced coercivity in the range of 500-2000 Oe. Negative magnetoresistance similar to 10% is observed in the presence of magnetic field up to 11 T applied at various temperatures in the range of 1.3 K-300 K. It is argued that the enhanced coercivity is due to the shape anisotropy. The negative magnetoresistance is believed to be due to the weak localization and spin dependent scattering of electrons by the ferromagnetic particles. In addition we also observe a dependence of the magnetoresistance on the direction of applied field and this is correlated with the shape anisotropy of the Fe particles.

Item Type: Conference Paper
Additional Information: Copyright of this article belongs to American Scientific Publishers.
Keywords: Carbon Nanotubes;Fe Nanoparticle;Coercivity;Shape Anisotropy.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Depositing User: Id for Latest eprints
Date Deposited: 15 Dec 2009 09:36
Last Modified: 15 Dec 2009 09:36
URI: http://eprints.iisc.ac.in/id/eprint/23264

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