FMR study of carbon nanotubes filled with Fe3O4 nanoparticles
authors Kopyl, S; Timopheev, AA; Bystrov, VS; Bdikin, I; Teixeira, BMS; Maevskij, E; Sobolev, NA; Sousa, ACM
nationality International
journal JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
author keywords Carbon nanotubes; Magnetic nanoparticles; Ferromagnetic resonance; Ferrofluids
keywords MAGNETIC NANOPARTICLES; PARTICLES; RESONANCE; SPECTRA
abstract Ordered arrays of carbon nanotubes were produced using a non catalytic chemical vapour deposition. The multiwall nanotubes with an inner diameter of 120 nm were grown inside porous alumina templates and then filled with a magnetic colloid of 7.5 nm Fe3O4 particles. X-ray diffraction, electron microscopy and ferromagnetic resonance (FMR) were used to characterize structural and magnetic properties of the grown samples. To estimate the filling factor from the angular dependence of the FMR resonance field, we have derived an effective demagnetization factor for our system using the formalism proposed by Skomsky and Dubowik. Angular dependence of the FMR line width allows one to conclude about the non uniform filling, while temperature dependent measurements reflect typical features of a super paramagnetic resonance. (C) 2014 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0304-8853
year published 2014
volume 358
beginning page 44
ending page 49
digital object identifier (doi) 10.1016/j.jmmm.2014.01.029
web of science category Materials Science, Multidisciplinary; Physics, Condensed Matter
subject category Materials Science; Physics
unique article identifier WOS:000332393500009
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