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(a) SEM image of a nanostructured Co/CoO sample, (b) AFM topographic scan of an array of rectangular dots at zero applied field, and (c) MFM scan performed after field cooling under at 50 K.
First hysteresis cycles obtained by SQUID and MFM measurements at a temperature of 50 K. The letters highlight the magnetic fields of selected MFM images shown in Figs. 3 and 4.
MFM scans of a surface area performed along the descending field branch at (a) −100 mT, (b) −110 mT, (c) −130 mT, (e) −150 mT, and (f) −175 mT. (d) shows an overview scan of a surface area at .
MFM scans of a surface area performed along the ascending branch of the hysteresis cycle at (g) , (h) , and (i) .
Magnetization values derived from MFM analysis. is the average magnetization of the array. The other magnetization values represent the average local magnetizations calculated by summing over the neighbor atoms of each given atom.
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