We report on the microwave response of micrometer-wide antennas inductively coupled to a 30 nm thick permalloy film. We show that the self-inductance of a single antenna measures the coupling between the exciting current and the spin wave modes of the film. On the other hand, the signal transmitted to a second, distant antenna is used to observe the free relaxation law of a magnetostatic wave packet. All measurements, performed over a frequency range of 1–20 GHz, are quantitatively consistent with magnetostatic wave theory combined with Gilbert formulation of the damping.
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Bailleul et al. (2003) studied this question.
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