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Aging tests for Co3Fe α-pillars. (a) shows an MFM-phase map of CoPt sample after fabrication, while (b) shows the same nano-probe on the same sample and the same AFM instrument with very similar operation parameters after a 45-weeks storage in ambient conditions. As can be seen, there is practically no loss of signal strength (compare insets, average phase shifts), image quality, or noise, which proves the chemical long-time stability of such 3D nano-probes.
