Anisotropic attenuation of GHz-frequency acoustic phonons and the Grüneisen tensor in MgO crystal

We report on measurements of the anisotropy of velocities and attenuation of GHz-frequency acoustic phonons in a cubic MgO crystal at room temperature. They are used to quantify the strong anisotropy of the Grüneisen parameter and calculate the attenuation anisotropy for Rayleigh surface acoustic wa...

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Bibliographic Details
Published in:	Applied physics letters Vol. 124; no. 15
Main Authors:	Akhmedzhanov, F. R., Makharov, N. M., Lomonosov, A. M., Temnov, V. V.
Format:	Journal Article
Language:	English
Published:	Melville American Institute of Physics 08-04-2024
Subjects:	Acoustic attenuation Anisotropy Gruneisen parameter Laser applications Magnesium oxide Mathematical analysis Phonons Room temperature Surface acoustic waves Tensors Ultrafast lasers Ultrahigh frequencies
Online Access:	Get full text
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Summary:	We report on measurements of the anisotropy of velocities and attenuation of GHz-frequency acoustic phonons in a cubic MgO crystal at room temperature. They are used to quantify the strong anisotropy of the Grüneisen parameter and calculate the attenuation anisotropy for Rayleigh surface acoustic waves. These observations constitute important building blocks for better understanding of ultrafast laser-based magneto-acoustic and nonlinear acoustic experiments at ultrahigh frequencies.
ISSN:	0003-6951 1077-3118
DOI:	10.1063/5.0189944