Spin waves in a ferromagnetic monolayer are investigated taking into account indirect exchange [Ruderman-Kittel-Kasuya-Yosida (RKKY)] interaction mediated by electrons of a nonmagnetic metal substrate. Strong anomalies are found in the spin wave stiffness when spin lattice-line distances are close to the RKKY wavelength. Conditions for such coincidence and its relevance in epitaxial magnetic layers on fcc metals are discussed taking into account realistic Fermi surface shapes, which further enhance the magnitude of the predicted effect but may change its sign.
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Kamberský et al. (1999) studied this question.
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