Abstract
It is noted that the hydrodynamic description of magnetic systems proposed by Enz starts from an incorrect equation of motion for the phase of the order parameter, by disregarding the difference between the gradient of this quantity and the quasimomentum. This leads to an unjustified identification of the hydrodynamic modes in different magnetic systems. It is shown that Enz's criticism of previous work is unjustified.
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Michel, K.H., Schwabl, F. Comment on “hydrodynamic description of magnetic crystals”. Phys kondens Materie 14, 78–79 (1971). https://doi.org/10.1007/BF02422393
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DOI: https://doi.org/10.1007/BF02422393