Premium
Sound Wave Velocity Change due to the Magnon‐Phonon Interaction
Author(s) -
Lord A. E.
Publication year - 1968
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.19680260237
Subject(s) - condensed matter physics , magnon , ferromagnetism , phonon , attenuation , magnetostriction , materials science , acoustic attenuation , atmospheric temperature range , physics , dielectric , magnetic field , quantum mechanics , thermodynamics
A calculation is given of the sound wave velocity change, in a ferromagnetic dielectric, due to the magnon‐phonon interaction. Results are given for a low temperature region. For a normal magnetoelastic ferromagnet, like YIG, the changes turn out to be too small to measure, and the changes are just measureable in highly magnetostrictive materials (like the rare earth iron garnets). The temperature dependence of the low temperature results, taken together with earlier, more general, work in regard to the sound wave attenuation due to the magnon‐phonon attenuation, lead one to believe that a significant velocity change (Δ v / v ≈ 10 −2 %) should be seen in highly magnetostrictive materials at the higher temperatures, and a measureable change in YIG in the range 25 to 50 °K. The change should be separable from other changes, via its dependence on applied magnetic field.