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We reconsider magnetic properties of fcc and hcp cobalt within the densityfunctional theory plus dynamical mean-field theory (DFT+DMFT) approach in theparamagnetic phase. Using recently proposed approach of calculation of exchangeinteractions in paramagnetic phase, we extract exchange interaction parametersof fcc and hcp cobalt and show that the hcp phase possesses larger spinstiffness, in agreement with the experimental data, showing stronger tendencyto ferromagnetism. Accordingly, the DMFT Curie temperature of the hcp phaseappears to be higher, than that of the fcc phase. The disappearance of magneticorder in the fcc phase well below the cobalt Curie temperature is expected toaffect its structural stability and make this phase energetically unfavourablenear the experimental Curie temperature. This may explain the "revival" of thehcp phase near the Curie temperature of cobalt, observed in the recentexperimental results of perturbed angular correlation study [Sci. Rep. {\bf12}, 10054 (2022)].

DFT+DMFT study of exchange interactions in cobalt and their implications for the competition of hcp and fcc phases