Sep 12 – 17, 2010
CERN
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Room temperature ferromagnetism in MWCNTs synthesized by chemical vapor deposition technique

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500/1-001 - Main Auditorium (CERN)

500/1-001 - Main Auditorium

CERN

CH - 1211 Geneva 23 Switzerland
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POSTER Surfaces, Interfaces, Thin Films, Nano-structures

Speaker

Dr Sanjeev Gautam (Nano Analysis Center, Korea Institute of Science and Technology, Seoul 136-791, S. Korea)

Description

This study reports the room temperature ferromagnetism in CNTs synthesized by chemical vapor deposition techniques using Fe and Co as catalyst. The samples are investigated through XMCD/XAS at Pohang Light Source, Korea.

Summary

Carbon nanotubes (CNTs) possess unique mechanical and electronic properties suitable for fabricating the nano-scale building blocks of nanodevices. Such nanoscale magnetic materials may be used in spin-dependant electronic devices and magnetic data storage. Because small particles depend strongly on the size [1], the control of their size and shape is indispensable for advance applications. In this study, MWCNTs synthesized by chemical vapor deposition (CVD) technique are investigated with synchrotron radiations at Pohang Light Source (PLS), Korea. Near edge x-ray absorption spectroscopy (NEXAFS) measurement at C K, Co L3,2 and Fe L3,2–edges, and x-ray magnetic circular dichroism (XMCD) at Co and Fe L3,2 –edges have been carried at 7B1 XAS KIST and 2A MS beamline respectively to understand the electronic structure and responsible magnetic interactions at room temperature. X-ray absorption spectroscopy (XAS) at C K-edge shows significant p-bonding and Co and Fe L-edges proves the presence of Co2+ and Fe2+ in octahedral symmetry. Fe and Co catalysts in these MWCNTS shows good XMCD signal at 300K and 90K. The effect on the magnetism is also studied through soft heavy ion (SHI) radiations and magnetism is found enhanced and change in the electronic structure in Co-CNTs is noticed.

[1] E. Wohlfarth, in: G. Rado, H. Suhl (Eds.), Magnetism, Vol. 3 (Academic Press, New York, 1963).

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Primary authors

Dr Keun Hwa Chae (Nano Analysis Center, Korea Institute of Science and Technology, Seoul 136-791, S. Korea) Dr Sanjeev Gautam (Nano Analysis Center, Korea Institute of Science and Technology, Seoul 136-791, S. Korea)

Co-authors

Dr J.H. Song (Nano Analysis Center, Korea Institute of Science and Technology, Seoul 136-791, S. Korea) Dr J.K. Kang (Material Science and Engineering, KAIST, Daejeon 305-701, S. Korea) Dr J.Y. Kim (Pohang Accelerator Lab, Pohang University of Science and technology (POSTECH), 791-784, S. Korea) Dr K. Asokan (Inter-University Accelerator Center, New Delhi -India) Dr S. Augustine (Material Science and Engineering, KAIST, Daejeon 305-701, S. Korea)

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