  We have carried out an analysis of magnetic data in 69 uranium, 7 neptunium
and 4 plutonium ferromagnets with the spin fluctuation theory developed by
Takahashi (Y. Takahashi, J. Phys. Soc. Jpn. 55, 3553 (1986)). The basic and
spin fluctuation parameters of the actinide ferromagnets are determined and the
applicability of the spin fluctuation theory to actinide 5f system has been
discussed. Itinerant ferromagnets of the 3d transition metals and their
intermetallics follow a generalized Rhodes-Wohlfarth relation between p_eff/p_s
and T_C/T_0, viz., p_eff/p_s ~ (T_C/T_0)^(-3/2). Here, p_s, p_eff, T_C, and T_0
are the spontaneous and effective magnetic moments, the Curie temperature and
the width of spin fluctuation spectrum in energy space, respectively. The same
relation is satisfied for T_C/T_0 < 1.0 in the actinide ferromagnets. However,
the relation is not satisfied in a few ferromagnets with T_C/T_0 ~1.0 that
corresponds to local moment system in the spin fluctuation theory. The
deviation from the theoretical relation may be due to several other effects not
included in the spin fluctuation theory such as the crystalline electric field
effect on the 5f electrons from ligand atoms. The value of the spontaneous
magnetic moment p_s increases linearly as a function of T_C/T_0 in the uranium
and neptunium ferromagnets below (T_C/T_0)_kink = 0.32 +- 0.02 where a kink
structure appears in relation between the two quantities. p_s increases more
weakly above (T_C/T_0)_kink. A possible interpretation with the
T_C/T_0-dependence of p_s is given.
