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Please use this identifier to cite or link to this item: http://hdl.handle.net/2262/63907

Title: An experimental study of the dynamic properties of nanoparticle colloids with identical magnetization but different particle size
Author: FANNIN, PAUL
Author's Homepage: http://people.tcd.ie/pfannin
Keywords: Particles and fields physics
Magnetic fluids
Ferrimagnetic resonance
Magnetic anisotropy
Damping parameter
Precessional decay time
Issue Date: 2012
Citation: P.C. Fannin, C.N. Marin, K. Raj, C. Couper, P. Barvinschi, An experimental study of the dynamic properties of nanoparticle colloids with identical magnetization but different particle size, Journal of Magnetism and Magnetic Materials, 324, 21, 2012, 3443 - 3447
Series/Report no.: Journal of Magnetism and Magnetic Materials
324
21
Abstract: Measurements of the frequency dependent complex magnetic susceptibility, χ(ω)=χ′(ω)−iχ″(ω), have been used to determine the dynamic properties of three specially prepared 400 G (0.04 T) magnetic fluids. The samples, denoted by sample 1, sample 2 and sample 3, consisted of magnetite particles of mean diameter 6.4 nm, 7.5 nm and 9 nm respectively and were identical in terms of carrier liquid, surfactant and particle material. From polarised ferromagnetic measurements, the anisotropy field, HA, the Landau-Lifshitz damping parameters, α, and the precessional decay time, τ0 of the particles were determined. The results show that the HA value for sample 3 was almost twice that of sample 1 and 2, thus confirming that the smaller the particle size, the lower the value of HA. The damping parameter, α, was found to be 0.174 (for sample 1), 0.18 (for sample 2) and 0.16 (for sample 3). The values determined for the precessional decay time, τ0 were 1.197×10−9 s, 1.157×10−9 s and 0.789×10−9 s, for samples 1, 2 and 3 respectively.
Description: PUBLISHED
URI: http://hdl.handle.net/2262/63907
Related links: http://dx.doi.org/10.1016/j.jmmm.2012.02.061
http://dx.doi.org/10.1016/j.jmmm.2012.02.061
Appears in Collections:Electronic & Electrical Eng (Scholarly Publications)

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