Anomalous frequency scaling of acoustic phonon damping in freestanding nickel cavities fabricated via laser delamination
Abstract
Single-shot picosecond (ps) laser-induced delamination allows for the direct generation of suspended membranes from a continuous metallic film, offering a promising platform for the control of ultrafast magnetization dynamics driven by acoustic waves. Using the picosecond-ultrasonics method, we demonstrate that long-lived low-frequency acoustic waves can be optically excited in the delaminated cavities. At the same time, higher-frequency modes above 60 GHz exhibit a surprisingly fast damping, following a scaling law incompatible with the expected attenuation mediated by phonon–phonon scattering. Comparing measurements between delaminated cavities and a benchmark nickel film in contact with the substrate, we link our findings to structural modifications of the nickel crystal induced by the delamination process.
Article Details
Journal Info
Applied Physics Letters
American Institute of Physics
Authors (12)
Alba Viejo Rodríguez
Department of Physics and Materials Science, University of Luxembourg 1 , 162a Avenue de la Faïencerie, 1511 Luxembourg,
Andrea Rossetti
Department of Physics and Materials Science, University of Luxembourg 1 , 162a Avenue de la Faïencerie, 1511 Luxembourg,
Marco Gandolfi
Dipartimento di Ingegneria dell'Informazione, Università degli Studi di Brescia 3 , Via Branze 38, 25123 Brescia,
Yoav Urbina Elgueta
CIC nanoGUNE, Tolosa Hiribidea 6 , 76, 20018 Donostia-San Sebastián,
Evgeny B. Modin
CIC nanoGUNE, Tolosa Hiribidea 6 , 76, 20018 Donostia-San Sebastián,
Svetlana Starikovskaia
LSI, Ecole Polytechnique, CEA/DRF/IRAMIS, CNRS, Institut Polytechnique de Paris 7 , 91128 Palaiseau,
Tat Loon Chng
LSI, Ecole Polytechnique, CEA/DRF/IRAMIS, CNRS, Institut Polytechnique de Paris 7 , 91128 Palaiseau,
Vasily V. Temnov
Maria Antonietta Vincenti
Daniele Brida
Department of Physics and Materials Science, University of Luxembourg 1 , 162a Avenue de la Faïencerie, 1511 Luxembourg,
Paolo Vavassori
ClC nanoGUNE BRTA 1 , E-20018 Donostia-San Sebastian,
Nicolò Maccaferri