Orbital magnetic dynamics in chiral p-wave superconductors
  We present a theory of orbital magnetic dynamics for a chiral p-wave superconductor with broken time-reversal symmetry. In contrast to the common Landau-Lifshitz theory for spin ferromagnets, the case of orbital magnetism cannot be described in terms of local magnetization density. Hence it is impossible to define unambiguously the spontaneous magnetic moment: the latter would depend on conditions of its experimental investigation.   As an example of this we consider orbital magnetization waves and the domain structure energy. 
V. Braude and E. B. Sonin