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Ferromagnetic resonance damping in garnets: comparison between saturated and unsaturated states

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4 Author(s)

The influence of magnetic state (saturated or unsaturated states) on the ferromagnetic resonance damping in relaxing rare earth substituted Y1-xRExGd2Fe5O 12 garnets (with RE=Dy Ho, Tb and x=0;0.15;0.3;0.6) has been studied. The damping parameter a, as defined by Landau-Lifshitz equation, has been determined either by FMR at 10 GHz (αsat for saturated state) or by measurement of the frequency dependence of the complex initial permeability in the 0.1 GHz-10 GHz band (αunsat for unsaturated state). In the saturated state the introduction of relaxing rare earth is found to increase significantly αsat values by more than one order of magnitude. On the contrary, although αunsat values also increase with rare earth concentration they stay in the same order of magnitude. It appears that αunsat is controlled either by the magnetic disorder introduced via the domain and domain wall structure or by the rare earth concentration

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Magnetics, IEEE Transactions on  (Volume:34 ,  Issue: 4 )