ELECTRONIC-STRUCTURE OF HELICAL SPIN-DENSITY WAVE STATE IN FCC IRON

The spin density wave in fcc iron is discussed on the basis of electronic structure calculation. The electronic structure of helical spin density wave states with finite local magnetic moments is calculated for fcc iron by a tight-binding model Hamiltonian with a minimal basis set, which is obtained through some simplification to the first-principle LMTO method. The wave vector of the helical spin density wave state of lowest energy is found to be in good agreement with recent neutron diffraction experiments for fcc iron precipitates. The calculation is also carried out for chromium, and difference in characteristics of the spin density wave between fcc iron and chromium is discussed.