Eur. Phys. J. AP 8, 247-251 (1999)
https://doi.org/10.1051/epjap:1999252

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

¹ Department of Electronic & Electrical Engineering, Trinity College, Dublin 2, Ireland
² Laboratoire de Recherche sur les Capteurs à Colloides et L'Instrumentation, LRCCI, Université Jean-Monnet, 42023 Saint-Etienne Cedex 2, France
³ Laboratoire de Physicochimie Inorganique, L12C, Colloides Magnetiques, Université P. et M. Curie, Bât. F, Case 740, 63 Place Jussieu, 75252 Paris Cedex 05, France

Corresponding author: pfannin@tcd.ie

Received: 13 July 1999
Revised: 8 November 1999
Accepted: 9 November 1999
Published online: 15 December 1999

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, , and anisotropy field 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.