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Ferromagnetic Resonance of Co/Gd and Co/Tb Multilayers

The in-plane dynamics of ferrimagnetic Co/Gd multilayers are investigated by means of ferromagnetic resonance, magneto-optical Kerr effect and SQUID magnetometry. The power absorbed from these multilayers is strongly temperature dependent. For example, the resonant peak for a (Co 40 A /Gd 40 A)8 multilayer vanishes approximately 50 K below room temperature. We have further investigated 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-based trilayers show a shift of approximately 600 Oe at 24 GHz in the uniform ferromagnetic resonance field, compared to pure Co film, indicating the exchange coupling between the Co and Gd. The shift in the field for the resonance increases as the temperature is decreased. Furthermore the resonance linewidth increases as the temperature is decreased. The experimental results are in good agreement with our theoretical calculations.

preprint2010arXivOpen access
S. DemirtasI. HarwardR. E. CamleyZ. CelinskiM. R. HossuA. R. KoymenC. YuM. J. Pechan
cond-mat.mtrl-sci
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S. DemirtasI. HarwardR. E. CamleyZ. CelinskiM. R. HossuA. R. KoymenC. YuM. J. Pechan

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