Abstract
Using a first-order Green's function technique, the spin wave spectrum of a layered ferromagnetic electron system is determined in the long-wave length limit. It is shown that the spin wave stiffness is a highly anisotropic quantity. A discussion of the Stoner-Overhauser-Wohlfarth condition shows that both electron tunneling processes and a more sophisticated expression of the Coulomb interaction matrix element than the usual Hubbard form are important for the existence of ferromagnetic ordering.
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Gasser, W. Spin waves of a layered ferromagnetic electron gas. Z. Physik B - Condensed Matter 63, 199–202 (1986). https://doi.org/10.1007/BF01309239
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DOI: https://doi.org/10.1007/BF01309239