Magnetic properties of microwave-plasma (thermal) chemical vapour deposited Co-filled (Fe-filled) multiwall carbon nanotubes: comparative study for magnetic device applications
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Date
2018-07-04
Authors
Mathur, A.
Maity, Tuhin
Wadhwa, Shikha
Ghosh, B.
Sarma, Sweety
Ray, Sekhar C.
Kaviraj, Bhaskar
Roy, Susanta S.
Roy, Saibal
Journal Title
Journal ISSN
Volume Title
Publisher
IOP Publishing
Published Version
Abstract
'Co-filled' and 'Fe-filled' multiwall carbon nanotubes (MWCNTs) were grown using microwave-plasma chemical vapour deposition (MPCVD) and thermal chemical vapour deposition (TCVD) methods respectively, and their structural and magnetic properties were studied for magnetic device applications. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images show the average tube length approximate to 80-500 mu with outer (inner) diameter approximate to 20-50 (approximate to 10-20) nm for MWCNTs prepared by both methods. The diffraction peaks of both x-ray diffraction patterns show the interlayer distance, d(002) approximate to 3.36 , which is comparable to the graphite structure (d(002) = 3.35 ). The graphitic crystallite sizes (L-a) of MPCVD (TCVD) synthesized MWCNTs are approximate to 24.78 nm (approximate to 22.13 nm) as obtained from the intensity ratio of (I-D/I-G) D-peak, the disordered structure of graphite and G-peak, the C-C bond in graphitic structure of Raman spectra. The magnetization of 'Fe-filled' TCVD grown MWCNTs is much higher than 'Co-filled' MPCVD grown MWCNTs due to the formation of higher content of Fe-C and/or Fe-oxides in the MWCNT structures. The higher magnetic coercivity approximate to 2900 Oe and formation of isolated single-domain Fenanoparticles in 'Fe-filled' TCVD grown MWCNTs, as found from SEM / TEM micrographs, makes the ferromagnetic MWCNTs a promising material for the high-density magnetic recording media.
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Keywords
MWCNTs , M-H loops , Raman spectra , XRD
Citation
Mathur, A., Maity, T., Wadhwa, S., Ghosh, B., Sarma, S., Ray, S. C., Kaviraj, B., Roy, S. S. and Roy, S. (2018) 'Magnetic properties of microwave-plasma (thermal) chemical vapour deposited Co-filled (Fe-filled) multiwall carbon nanotubes: comparative study for magnetic device applications', Materials Research Express, 5(7), 076101 (8pp). doi: 10.1088/2053-1591/aacddb