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On the influence of a uniform magnetic field on the Néel relaxation of a colloidal suspension of nanometre-sized particles

Measurements of the complex, frequency-dependent susceptibility, , of three colloidal suspensions of magnetite in isopar M (a hydrocarbon carrier) in the frequency range 30 MHz to 6 GHz for 14 values of the polarizing field, H, over the range 0 - 116 kA are presented. The effect of the polarizing field on the real and imaginary susceptibility profiles of the suspensions is clearly demonstrated and these measurements reveal the presence of a subsidiary loss peak in the component. This effect is found to exist over the approximate polarizing field range 9.5 - 40 kA and may be attributed to the presence of relatively strong high-frequency relaxation modes superimposed on the Néel relaxation mode, as originally predicted by Coffey et al and later analytically explained by Garanin. The dependence of this effect on the particle concentration is demonstrated.