Abstract
Absorption of ultrasound in nanocomposite materials during the application of external magnetic field was considered in this study. Interaction of acoustic waves with crystal lattices of condensed media depends on many factors such as the type of the crystal lattice, Debye temperature and temperature of the condensed medium, as well as Debye frequency and frequency of the ultrasound. Debye frequency and Debye temperature determine elasticity of the crystal lattice and, consequently, its sound absorbing properties. For measurement and calculation of the coefficient of ultrasound absorption it is necessary to estimate the interaction of acoustic phonons with thermal phonons and electrons of investigated crystalline material. Application of external magnetic field on given material leads to the appearance of magnons that interact with the crystal lattice. As a result the ratio “acoustic phononthermal phonon” and, accordingly, sound absorption quantitatively increase. Experimental results obtained in this study coincide with the general picture of sound absorption obtained by other researchers, for example, in the measurement of acoustomagnetic resonance and in concept of magnon-phonon interaction.
Highlights
Ultrawave absorption in the crystal lattices occurs as result of phonon interactions and electron-phonon interactions
Acoustic phonon interacts with thermal phonon of lattice oscillations of the crystal lattice
Phonon-phonon interactions are distinctive for the crystal lattices of dielectrics
Summary
Ultrawave absorption in the crystal lattices occurs as result of phonon interactions and electron-phonon interactions. Sound absorption coefficient depends on the rate of decrease of the phonons of sound mode in the collision of acoustic and thermal phonons. During such interaction acoustic phonon disappears and third phonon is formed. Electron-phonon interactions take place in the crystal lattices of metals. For the latter phononphonon interactions cannot be excluded. Nanocomposite materials will be dependent on the type and temperature of the crystal lattices of nanoparticles that form the basis of this material. Application of alternating magnetic field on nanocomposite material leads to additional increase in ultrasound absorption (Lotonov et al, 2006; Kezilebieke et al, 2013; Nyssanbayeva and Omarov, 2015).
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