Skyrmion Dynamics in a Double-Disk Geometry under an Electric Current: Part Two.

Area of Science:

• Condensed Matter Physics
• Materials Science
• Computational Physics

Background:

• Skyrmions are topologically protected spin textures with potential applications in data storage and spintronics.
• Understanding skyrmion dynamics is crucial for designing skyrmionic devices.

Purpose of the Study:

• To investigate the dynamical behavior of two nucleated skyrmions in a double-disk structure.
• To identify and characterize different dynamic regimes under varying geometric and electric current conditions.

Main Methods:

• Numerical simulations were employed to model skyrmion interactions and dynamics.
• The study systematically varied geometric parameters and electric current densities.

Main Results:

• Four distinct dynamic regimes were identified: stagnation points, oscillatory motion, partial skyrmion annihilation, and total skyrmion annihilation.
• The observed dynamics are attributed to the interplay of forces acting on the skyrmions.
• A state diagram was developed to map these dynamic regimes.

Conclusions:

• The geometry and electric current critically influence skyrmion dynamics in double-disk structures.
• The findings provide a framework for understanding and controlling skyrmion behavior for potential applications.