Theoretical study of phonon spectra in ferromagnetic nanoparticles |
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Authors: | JM Wesselinowa I Apostolova |
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Institution: | a University of Sofia, Department of Physics, Blvd. J. Bouchier 5, 1164 Sofia, Bulgaria b University of Forestry, Faculty of Forest Industry, 10 Kliment Okhridsky Blvd., 1756 Sofia, Bulgaria |
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Abstract: | Based on the spin-phonon model we analyze the influence of surface and size effects on the phonon properties of ferromagnetic nanoparticles. A Green's function technique in real space enables us to calculate the renormalized phonon energy and its damping depending on the temperature and the anharmonic spin-phonon interaction constants. With decreasing particle size the phonon energy can decrease or increase for different surface spin-phonon interaction constants, whereas the damping increases always. The influence of an external magnetic field is discussed, too. The theoretical results are in reasonable accordance to experimental data. |
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Keywords: | 63 22 +m 63 10 +a 63 20 Ls 63 20 Kr |
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