Influence of exchange-coupled anisotropies on spin-wave frequencies in magnetic layered systems: Application to Co/CoO

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Abstract
Recent experiments in Co/CoO layered structures have shown a huge effect where the frequency of the lowest spin wave in the ferromagnetic Co has been doubled, apparently due to the interaction with antiferromagnetic CoO. We explore a microscopic model for spin waves in such coupled structures which can explain such an effect. In this model a magnetic material with a significant anisotropy is exchange coupled to a different magnetic material with minimal anisotropy. The shift in the spin-wave frequency increases as either the anisotropy or interface exchange is increased. © 1996 The American Physical Society.