ACTIVATION SPIN-WAVES IN THE LANDAU THEORY OF FERMI-LIQUID

The activation spectra of collective oscillations with a quadratic ene rgy-momentum relation are studied for magnetically ordered Fermi liqui d. It is shown that the spectrum of activation spin waves depends cons iderably on the structure of the Landau interaction amplitude as a fun ction of the angle between quasimomenta of fermions. The existence of activation spin waves is manifested in neutron and light scattering pr ocesses as well as in the transformation of waves in magnetically orde red media. (C) 1997 American Institute of Physics.