The influence of individual lattice defects on the domain structure in   magnetic antidot lattices
  We numerically and experimentally investigate the influence of single defects consisting of a missing antidot on the spin configurations in rectangular permalloy antidot lattices. The introduction of such lattice defects leads to the nucleation of complex domain structures after the decay of a saturating magnetic field. Micromagnetic simulations yield four typical domain configurations around the defect having distinct energy densities. The existence of the four spin configurations is confirmed by magnetic force microscopy on antidot lattices containing individual defects. 
X.K. Hu, S. Sievers, A. M\"uller, and H.W. Schumacher
cond-mat.mes-hall