Small magnetic particles with uniaxial magnetic anisotropy are under i
nvestigation. A possible mechanism of amplification of the RF field ac
ting on nuclei in fine magnetic particle systems is described. The cal
culations are based on the exact solution of the proper Fokker-Planck
equation using the matrix continued fractions method. This more genera
l approach expands and reaffirms results first obtained with the discr
ete orientation approximation.