Topography and magnetic image of a typical region of the sample. (a) Topography and (b) MFM image of the array of nanowires (frequency shift contrast 11 Hz). Images size: 25.5 × 18.5 μm. Notice how the domain configuration is a function of the aspect ratio of the nanostructures (c) Nanowires domain configuration distribution as a function of their dimensions.
Jaafar et al. Nanoscale Research Letters 2011 6:407 doi:10.1186/1556-276X-6-407