Intrinsic switching field distribution of arrays of Ni80Fe20 nanowires   probed by $\mathit{in\, situ}$ magnetic force microscopy
  The progress of magnetization reversal of weakly packed ferromagnetic Ni80Fe20 nanowire arrays of different diameters (40, 50, 70 and 100 nm) electrodeposited in polycarbonate membranes was studied by magnetic force microscopy (MFM). For such a low packing density of nanomagnets, the dipolar interactions between neighbouring wires can be neglected. The intrinsic switching field distribution has been extracted from in situ MFM images and its width was found to be considerably smaller than for densely packed nanowire arrays. 
M. R. Tabasum, F. Zighem, J. De La Torre Medina, L. Piraux and B.   Nysten
cond-mat.mtrl-sci