A computer simulation model for estimation of the interaction fields i
n fine particle systems has been developed, The method uses the experi
mental delta M-alpha(H) plot, constructed from the Fourier description
of the initial magnetization curve and the hysteresis loop, and the d
elta M(H) plot, obtained from the remanence curves, The dependencies o
f the interaction fields on the external magnetic field have been obta
ined from the experimental data for a sample of a Ba-ferrite fine powd
er.