  Barcode magnetic nanowires typically comprise a multilayer magnetic structure
in a single body with more than one segment type. Interestingly, owing to
selective functionalization and novel interactions between the layers, barcode
magnetic nanowires have attracted significant attention, particularly in the
field of bioengineering. However, an analysis of their magnetic properties at
the individual nanowire level remains challenging. With this background,
herein, we investigated the characterization of magnetic nanowires at room
temperature under ambient conditions based on magnetic images obtained via
wide-field quantum microscopy with nitrogen-vacancy centers in diamond.
Consequently, we could extract critical magnetic properties, such as the
saturation magnetization and coercivity, of single nanowires by comparing the
experimental results with those of micromagnetic simulations. This study opens
up the possibility for a versatile characterization method suited to individual
magnetic nanowires.
