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Analyses of magnetization switching and magnetic domains in lateral MnAs nanowires in combination with structural characterization

We report on structural and magnetic characterization results of lateral MnAs nanowires formed by selective-area metal–organic vapor phase epitaxy. The lateral MnAs nanowires observed by backscattered and secondary electron microscopies have a high aspect ratio (i.e., 2.6 µm long and 360 nm wide) and well-defined crystal facets. The external magnetic field dependence in magnetic force microscopy observations of the lateral nanowires reveals that single and multiple magnetic domains were formed in the lateral nanowires. This study suggests that magnetic domains are tuned by the structural control of lateral nanowires. However, no magnetization switching is observed under a relatively high external magnetic field of 5000 G, which should be enough for the magnetization switching of the lateral nanowires, possibly owing to the magnetization switching of the magnetic force microscope tip itself used in this study during observations.