Phys. Rev. Lett. 83, 3542–3545 (1999)Time Evolution of Spin WavesReceived 1 June 1999; published in the issue dated 25 October 1999 A rigorous derivation of macroscopic spin-wave equations is demonstrated. We introduce a macroscopic mean-field limit and derive the so-called Landau-Lifshitz equations for spin waves. We first discuss the ferromagnetic Heisenberg model at T = 0 and finally extend our analysis to general spin Hamiltonians for the same class of ferromagnetic ground states. © 1999 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.83.3542
DOI:
10.1103/PhysRevLett.83.3542
PACS:
75.40.Gb, 05.70.Ln, 67.57.Lm
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