Nonintegrability of (2+1)-dimensional continuum isotropic Heisenberg   spin system: Painlev\'e analysis
  While many integrable spin systems are known to exist in (1+1) and (2+1) dimensions, the integrability property of the physically important (2+1) dimensional isotropic Heisenberg ferromagnetic spin system in the continuum limit has not been investigated in the literature. In this paper, we show through a careful singularity structure analysis of the underlying nonlinear evolution equation that the system admits logarithmic type singular manifolds and so is of non-Painlev\'e type and is expected to be nonintegrable. 
C.Senthil Kumar, M.Lakshmanan, B.Grammaticos and A.Ramani