Free core nutation (FCN) is the main factor that limits the accuracy of the modeling of the motion of Earth’s rotational axis in the celestial coordinate system. Several FCN models have been proposed. A comparative analysis is made of the known models including the model proposed by the author. The use of the FCN model is shown to substantially increase the accuracy of the modeling of Earth’s r...

The magnetic inertial dynamics have been investigated for one sublattice ferromagnets. Here, we develop the magnetization in two-sublattice ferromagnets including intra- and inter-sublattice dynamics. First, derive susceptibility of such a ferromagnet. Next, by finding poles susceptibility, calculate precession nutation resonance frequencies. Our results suggest that while frequencies show decr...