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A study of the frequency dependent susceptibility of a colloidal suspension of manganese ferrite (MnFe204) nanoparticles

Published online by Cambridge University Press:  15 December 1999

P. C. Fannin ,
D. Vincent ,
G. Massart ,
P. Perov  and
S. Neveu
P. C. Fannin*
Affiliation:
Department of Electronic & Electrical Engineering, Trinity College, Dublin 2, Ireland
D. Vincent
Affiliation:
Laboratoire de Recherche sur les Capteurs à Colloides et L'Instrumentation, LRCCI, Université Jean-Monnet, 42023 Saint-Etienne Cedex 2, France
G. Massart
Affiliation:
Laboratoire de Physicochimie Inorganique, L12C, Colloides Magnetiques, Université P. et M. Curie, Bât. F, Case 740, 63 Place Jussieu, 75252 Paris Cedex 05, France
P. Perov
Affiliation:
Department of Electronic & Electrical Engineering, Trinity College, Dublin 2, Ireland
S. Neveu
Affiliation:
Laboratoire de Physicochimie Inorganique, L12C, Colloides Magnetiques, Université P. et M. Curie, Bât. F, Case 740, 63 Place Jussieu, 75252 Paris Cedex 05, France
*
pfannin@tcd.ie
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Abstract

Measurements of the complex, frequency dependent susceptibility, χ(ω) = χ′ (ω) − i χ′′ (ω) over the frequency range 50 MHz to 15 GHz, of a surfacted ferrofluid comprising MnFe204 ferrite particles in dibutylphthalat (DBP), as a function of a biasing magnetic field are presented. The biasing field was varied over the range 0 to 100 kAm−1, and has enabled average values of anisotropy constant, $\bar{K}$, and anisotropy field $\bar{H}_{\rm A}$ for the sample to be determined. Ferromagnetic resonance was exhibited for all values of the biasing field, covering the range 1.2 to 8.5 GHz, with the χ′ (ω) component of the susceptibility going negative in the GHz region.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 8 , Issue 3 , December 1999 , pp. 247 - 251
Copyright
© EDP Sciences, 1999

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