Abstract
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.
Highlights
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
From x-ray reflectivity (XRR) we find a roughness of 0.45 nm for the magnesium oxide (MgO), and 0.3 nm for the ZrO2 layers respectively
Being the basic method in the field of picosecond ultrasonics, this approach is well-known for its ability to induce and measure coherent elastic dynamics in the upper microwave frequency range[29, 30]
Summary
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. Being the basic method in the field of picosecond ultrasonics, this approach is well-known for its ability to induce and measure coherent elastic dynamics in the upper microwave frequency range[29, 30].
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