Abstract
Magnetodynamics of magnetic nanolayers is central to the emerging research field of magnonics. Here, we demonstrate an effective tuning of the dynamic properties of permalloy (Py, response layer) thin films, by capping with $\mathrm{Cu}/\mathrm{Fe}$-$\mathrm{Co}$-$\mathrm{Tb}$ (spin-sink layer) layers with adjustable interlayer coupling and magnetic configurations. The strategy enables a remarkably enhanced Gilbert damping of the response layer, by about 10 times; this enhancement is higher than most of the results reported so far. More importantly, dynamic damping is programmable between the two opposite configurations (parallel vs antiparallel) in Py and $\mathrm{Fe}$-$\mathrm{Co}$-$\mathrm{Tb}$ and remains intact even in the form of nano- and microdevices. The interlayer coupling between Py and $\mathrm{Fe}$-$\mathrm{Co}$-$\mathrm{Tb}$ is systematically studied by changing the thickness of the $\mathrm{Cu}$ spacer. It is demonstrated that the dynamic interlayer coupling between ferromagnetic layers plays the key role in increased damping. Our work provides a feasible route towards reconfigurable magnonic devices, especially for logic and high-speed computing.
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