COLLECTIVE ORBITAL EXCITATIONS IN 3D-MAGNETS

In a magnetic ordering state of Sd-magnets the mode of collective orbi tal excitations is predicted. The frequency of this mode is proportion al to the value of ''unfrozen'' orbital moment due to a weak spin-orbi t interaction. The manifestation of orbital excitations in a magnetic susceptibility and gyrotropic birefringence is analysed. In uniaxial 3 d-ferroelectromagnets orbital moment takes off a generation in an opti cal phonon spectrum and induces the precession of electric dipole mome nt.