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MFM images in external fields of (a) and (b) for a sample area of ; white spots indicate reversed pillars and black unreversed pillars. In (c) and (d) are the converted binary data of (a) and (b), respectively. In (c) and (d), the gray is for unreversed pillars and white for reversed pillars .
The dipolar energy per pillar vs normalized magnetization for (a) experimental data and (b) a totally random simulation (no correlation) in pillars. Open squares correspond to first nearest neighbor dipolar energy values and closed triangles correspond to second nearest neighbors.
The dipolar energy per pillar vs normalized magnetization of (a) first nearest neighbors and (b) second nearest neighbors, from a Ising spin simulation. The thick and thin lines correspond to the case of and , respectively. is the standard deviation of the Gaussian distribution.
The dipolar energy per pillar vs normalized magnetization of (a) first nearest neighbors and (b) second nearest neighbors. The solid graph shows the simulation results for and the open squares represent the experimental data for the pillar system. (c) Hysteresis loops from a MFM measurement (open squares), a simulation with (closed triangles), and a VSM measurement (solid line). The simulation and VSM data were shifted by to match the MFM data.
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