Abstract
The hydrodynamic equations for an easy-plane (planar) ferromagnet are derived by analogy with the hydrodynamics of liquid helium. The relaxation of the magnitude of an order parameter is taken into account. The derivation is based on microscopic dynamics and the nonequilibrium statistical operator method. The hydrodynamic equations are generally nonlocal in space and in time and hold for all T< T c. Transport coefficients are expressed in terms of time correlation functions and their symmetry properties are investigated.
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More From: Physica A: Statistical Mechanics and its Applications
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