Spin excitations in multilayered ferromagnetic electron gases

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Abstract
Spin excitations in a periodic array of layered ferromagnetic electron gases are discussed within the generalized Hubbard approximation. It is shown that the Stoner gap and the spin waves display appropriate crossover behavior (from two to three dimensions) on going from the weak- to strong-coupling regime. Their anisotropic behavior depends not only on the electron tunneling between adjacent layers, but on the screened Coulomb potential as well. The screening anisotropy even affects the existence of the collective modes.