Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2007-01-18
Low Temp. Phys. v.33, No 1 (January) (2007)
Physics
Condensed Matter
Statistical Mechanics
28 pages, 10 figures
Scientific paper
Bose condensation of quasiparticles in physical systems of finite size iz considered for the case of ferromagnetic thin films. It is shown that in accordance with present-day experimental capabilities which permit one to achieve densities of long-wave spin excitation of 1018-1019 cm-3, in such films the formation of condensate of such quasiparticles begins at temperatures T~100 K (room one including). It is found that Bose condensation is accompanied by scaling phenomenon according to which the main thermodynamic variable is not the number N of particles but the ratio N/T. This indicates that condensation of magnons can be observed at relatively low magnon densities. The roles played by the shape of the spectrum and film thickness are analyzed.
Bugrij Anatolij I.
Loktev Vadim M.
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