Magnon — Spin Wave Precession
Ferromagnetic spin chain · collective excitations · magnon dispersion
Parameters
Wave vector k:
0.30
(π units)
Exchange J:
1.0
Applied field H:
0.5
Damping α:
0.0
Amplitude:
0.4
Pause
Magnon dispersion:
ω(k) = 2J(1−cos k) + H
Spin waves = quantized collective precessions in a ferromagnet. Low-k magnons are acoustic; energy ~ k².
LLG equation governs each spin. Damping α causes amplitude decay back to equilibrium.