  The Dzyaloshinskii Moriya Interaction (DMI) has laid the foundation for many
novel chiral structures such as Skyrmions. In most of the studies so far, the
DMI is present in the whole of the magnetic layer. Here, we report our
investigations on a ferromagnetic nanowire where DMI is confined to a nanoscale
region. We observe that the local modulation of magnetic properties causes
oscillation of domain walls under the influence of spin-transfer torque. The
oscillation frequency is tunable within a few GHz, making this observation
potentially useful for applications in neuromorphic computing.
