English abstract
Skyrmions are the smallest realizable magnetic textures, and they could be
considered an ideal element for ultra-dense magnetic memories. Skyrmions
can be stabilized by the Dzyaloshinskii-Moriya interaction. In the first part
of this study, the modified Landau-Lifshitz-Gilbert formalism was carried
out to understand the dependence between the physical parameters and the
stability and the motion of skyrmions. The width of the nanowire, the
magnetic anisotropy (Ku), the Dzyaloshinskii-Moriya interaction (DMI), the
exchange coupling (Aex), the saturation magnetization (Ms), and the Gilbert
damping coefficient (α) were varied, and the magnetization dynamics were
evaluated. It was found that all the parameters mentioned can affect the speed
and dimension of the skyrmion. The calculation was conducted using a
nanosecond pulsed current. In summary, a phase diagram combining several
parameters was established, which could define the optimal conditions for
small size skyrmions and high velocity.
