On the investigation of the after - effect function and precessional decay time of nano - particle colloids
Pages 45-50
P.C.Fannin
Abstract.
Measurement of the field and frequency dependent magnetic complex susceptibility, χ(ω, H) = χ' (ω, H)-i χ"(ω, H), of magnetic fluids, has proven to be a reliable method for investigating a number of important properties of such fluids including ferromagnetic resonance and relaxation times. Also, because of the inverse Fourier transform relationship which exists between the after-effect function, b(t), and χ"(ω), b(t) may be obtained and used in determining a value of the precessional decay time, t0.
Here, results obtained from measurements on a sample of Mn0.1Fe0.9Fe2O4 particles suspended in Isopar M, by means of the transmission line technique in the MHz - GHz range, are presented.