Abstract
We report in detail on the growth time dependence of ferromagnetic MnAs nanoclusters in vertical MnAs/InAs heterojunction nanowires and the analysis of magnetization switching in a heterojunction nanowire. The size of MnAs nanoclusters increases with increasing growth time of MnAs nanoclusters. In addition, we observe the magnetization and magnetization switching in one of the MnAs nanoclusters with a relatively large height parallel to the c-axis, i.e., the magnetic hard axis, possibly owing to the magnetic shape anisotropy along the c-axis, after the application of external magnetic fields nearly parallel to the c-axis of MnAs nanoclusters. These results suggest that the growth time of MnAs nanoclusters is a key to controlling the size, shape, and even magnetization of MnAs nanoclusters in vertical MnAs/InAs heterojunction nanowires.
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