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The in-plane dynamics of ferrimagnetic Co/Gd multilayers are investigated bymeans of ferromagnetic resonance, magneto-optical Kerr effect and SQUIDmagnetometry. The power absorbed from these multilayers is strongly temperaturedependent. For example, the resonant peak for a (Co 40 A /Gd 40 A)8 multilayervanishes approximately 50 K below room temperature. We have furtherinvestigated Gd/Co/Gd and Tb/Co/Tb trilayers with different thicknesses of Gd(5-7 A), Tb (1-7 A) and Co (30-40 A). At room temperature, these Co-basedtrilayers show a shift of approximately 600 Oe at 24 GHz in the uniformferromagnetic resonance field, compared to pure Co film, indicating theexchange coupling between the Co and Gd. The shift in the field for theresonance increases as the temperature is decreased. Furthermore the resonancelinewidth increases as the temperature is decreased. The experimental resultsare in good agreement with our theoretical calculations.

Ferromagnetic Resonance of Co/Gd and Co/Tb Multilayers