A strong laser impact on spin precession of a charged particle in the semi-relativistic interaction regime

In the present note new effects concerned the dynamics of a charged spin-1/2 particle in a strong monochromatic plane wave background are discussed beyond the conventional dipole approximation. Namely using the semiclassical approach in the semi-relativistic regime it is shown that the magnetic forces associated with the laser field have been retained and alter the spin evolution appreciably.