5 years ago

Spectral control of elastic dynamics in metallic nano-cavities

Hans-Ulrich Krebs, Florian Döring, Christian Eberl, Dennis Meyer, Henning Ulrichs
We show how the elastic response of metallic nano-cavities can be tailored by tuning the interplay with an underlying phononic superlattice. In particular, we exploit ultrafast optical excitation in order to address a resonance mode in a tungsten thin film, grown on top of a periodic MgO/ZrO2 multilayer. Setting up a simple theoretical model, we can explain our findings by the coupling of the resonance in the tungsten to an evanescent surface mode of the superlattice. To demonstrate a second potential benefit of our findings besides characterization of elastic properties of multilayer samples, we show by micromagnetic simulation how a similar structure can be utilized for magneto-elastic excitation of exchange-dominated spin waves.

Publisher URL: https://www.nature.com/articles/s41598-017-11099-y

DOI: 10.1038/s41598-017-11099-y

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