Theory of Raman Scattering by Magnetic Excitations in Ferromagnetic Transition Metals

Raman scattering of light by magnons and Stoner excitations in ferromagnetic metals is treated microscopically on the assumption that the magnetic electrons can be described by itinerant model. A microscopic theory of Raman scattering in metals is developed on the basis of the thermal Green function method. The total scattering efficiency of the one magnon process is estimated to be 10 -13 ∼10 -14 for iron in optical regions, and that of the one Stoner excitation process is expected to be the same order of magnitude although it depends on the details of the band strucrure.