[en] The investigation of hyperfine magnetic fields on samarium inpurity nuclei in ferromagnetic matrices is continued. In particular, the influence of annealing temperature on the effective magnetic field affecting the ¹⁵²Sm nuclei in the cobalt matrix is investigated. Implanted samples (implanted ions dose not exceeding 10¹² ion/cm²) of ¹⁵²SmCo have been annealed at the t deg=200, 400 and 600 deg C in vacuum of 10^-6 torr. The method of integral perturbed angular correlations (IPAC) of the 868-244 keV cascade has been used. The values of hyperfine magnetic field and f parameter characterizing the number of nuclei undergoing the hyperfine field effect are presented. With the annealing temperature increase the value of the field (or f) is decreased. On the basis of data obtained and already available the following conclusions are drawn: radiation induced defects strongly affect the IPAC results, defects evolution depends on the t deg of annealing which is bound to impurity ions migration and impurity-vacancy clusters formation, the hyperfine magnetic fields ratio is equal to that of the corresponding magnetic moments of the matrix