Energy of a Bloch Wall on the Band Picture. II. Perturbation Approach

Abstract

The "exchange stiffness" constant, which appears in the theory of the Bloch interdomain wall in ferromagnetics, can be calculated by computing the response of a saturated specimen to a small spatially varying perturbing field. This calculation is carried out here in the self-consistent field approximation, using running waves for the one-electron states, and the results is interpreted physically in terms of precession of the spins of moving electrons.