Abstract
The spin wave dispersion in ferromagnetic nickel has been computed in random phase approximation using the wave vector and frequency dependent magnetic susceptibility including many body enhancement effects. The latter were included using an orbital basis to invert the susceptibility matrices that are encountered in a local density, first principles version of a Stoner-like theory of many body enhancements. The complicated computer codes employed in the calculation were tested by computing numerically the wave vector and frequency dependent spin and orbital magnetic susceptibility of the uniform electron gas and comparing with known analytic expressions. Numerical work was done using the analytic tetrahedron method. For nickel the theory was simplified by introducing a single adjustable parameter in lieu of calculation of complicated integrals involving the band structure. The parameter was adjusted to yield agreement with a long wavelength spin wave neutron scattering measurement. With the fit parameter, good agreement with the experimental dispersion of spin waves in nickel was obtained for other wavelengths as well.
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