Giant magnetic moment at open ends of multiwalled carbon nanotubes

doi:10.1088/1674-1056/24/1/016202

Abstract

The attractions of cantilevers made of multiwalled carbon nanotubes (MWNTs) and secured on one end are studied in the non-uniform magnetic field of a permanent magnet. Under an optical microscope, the positions and the corresponding deflections of the original cantilevers (with iron catalytic nanoparticles at the free end) and corresponding cut-off cantilevers (the free ends consisting of open ends of MWNTs) are studied. Both kinds of CNT cantilevers are found to be attracted by the magnet, and the point of application of force is proven to be at the tip of the cantilever. By measuring and comparing deflections between these two kinds of cantilevers, the magnetic moment at the open ends of the CNTs can be quantified. Due to the unexpectedly high value of the magnetic moment at the open ends of carbon nanotubes, it is called giant magnetic moment, and its possible mechanisms are proposed and discussed.

Keywords: carbon nanotubes open ends giant magnetic moment

Received: 14 October 2014
Revised: 06 November 2014
Accepted manuscript online:

PACS:	62.20.-x	(Mechanical properties of solids)
	68.35.Gy	(Mechanical properties; surface strains)
	75.50.Dd	(Nonmetallic ferromagnetic materials)

Fund:

Project supported by the National Natural Science Foundation of China (Grant Nos. 10774032 and 51472057) and the Instrument Developing Project of the Chinese Academy of Sciences (Grant No. Y2010031).

Corresponding Authors: Chu Wei-Guo, Sun Lian-Feng
E-mail: wgchu@nanoctr.cn;slf@nanoctr.cn

Cite this article:

Wang Gang (王钢), Chen Min-Jiang (陈闽江), Yu Fang (余芳), Xue Lei-Jiang (薛磊江), Deng Ya (邓娅), Zhang Jian (张键), Qi Xiao-Ying (齐笑迎), Gao Yan (高燕), Chu Wei-Guo (褚卫国), Liu Guang-Tong (刘广同), Yang Hai-Fang (杨海方), Gu Chang-Zhi (顾长志), Sun Lian-Feng (孙连峰) Giant magnetic moment at open ends of multiwalled carbon nanotubes 2015 Chin. Phys. B 24 016202

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