Please use this identifier to cite or link to this item: http://hdl.handle.net/10773/19653
Title: FMR study of carbon nanotubes filled with Fe3O4 nanoparticles
Author: Kopyl, S.
Timopheev, A. A.
Bystrov, V. S.
Bdikin, I.
Teixeira, B. M. S.
Maevskij, E.
Sobolev, N. A.
Sousa, A. C. M.
Keywords: MAGNETIC NANOPARTICLES
PARTICLES
RESONANCE
SPECTRA
Issue Date: 2014
Publisher: ELSEVIER SCIENCE BV
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.
Peer review: yes
URI: http://hdl.handle.net/10773/19653
DOI: 10.1016/j.jmmm.2014.01.029
ISSN: 0304-8853
Publisher Version: 10.1016/j.jmmm.2014.01.029
Appears in Collections:CICECO - Artigos

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