A computer simulation study of the classical isotropic Heisenberg chain with an applied field

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Abstract
Results are presented of an extensive study of the classical one-dimensional ferromagnetically coupled Heisenberg magnet with an applied field. The variation of the spectrum of spin density fluctuations with temperature, applied field and wavevector have been investigated. The results at low temperature and strong applied field are shown to be consistent with non-interacting spin wave theory. At higher temperatures, and weaker field, qualitatively different behaviour is observed. The modifications to the spectra are attributed to the thermally activated spin-energy density coupling leading to a hybridised mode, which couples to both spin and energy densities.