  The dynamic behavior of non-collinear atomic spin arrangements in a
topologically protected magnetic skyrmion plays a pivotal role in potential
future spintronic technologies, including racetrack memory based
ultra-high-density storage devices. However, the topological nature of the
skyrmion comes with an unwanted skyrmion Hall effect (SkHE) that poses a
significant challenge in the practical application. Here we present a detailed
micromagnetic simulation study that delves into the controlled manipulation of
skyrmion dynamics through a subtle engineering of Dzyaloshinskii-Moriya
interaction (DMI) in a hybrid skyrmion racetrack. In particular, we introduce a
gradient variation of bulk and interfacial DMI that results into a parabolic
trajectory of Skyrmion Hall angle (SkHA), thereby allowing us to find a
critical DMI ratio with almost zero SkHE. Most importantly, we present a novel
approach involving engineering of a racetrack with strategically placed step
DMI regions that gives us a meticulous control over the size and speed of the
hybrid skyrmions. The present study gives a new direction for the simultaneous
realization of stable skyrmions without SkHE and increased skyrmion speed with
optimized DMI engineering.
