Interactions between atomic-scale skyrmions in 2D chiral magnets.

Area of Science:

• Condensed Matter Physics
• Materials Science
• Nanotechnology

Background:

• Skyrmions are topologically stable spin textures with potential for magnetic memory applications.
• Recent observations of nanometer-scale skyrmions enable ultrahigh-density integration.
• Controlling skyrmion interactions is key for device development.

Purpose of the Study:

• To numerically investigate interactions between atomic-scale skyrmions.
• To understand the influence of tilted magnetic fields and magneto-crystalline anisotropy on skyrmion behavior.
• To explore the feasibility of controlling atomic-scale skyrmions for future technologies.

Main Methods:

• Numerical simulations of skyrmion interactions in two-dimensional chiral magnets.
• Analysis under tilted magnetic fields and magneto-crystalline anisotropy.
• Investigation across various skyrmion sizes and lattice potentials.

Main Results:

• Attractive potential wells persist at the atomic scale, similar to larger skyrmions.
• Short-range repulsion increases as skyrmions shrink; tilted fields enhance attraction.
• Magneto-crystalline anisotropy creates deep attractive wells, enabling tightly bound skyrmion pairs.
• Atomic lattice potentials can pin smaller skyrmions, suppressing motion.

Conclusions:

• Atomic-scale skyrmions can form tightly bound pairs with significant binding energies.
• Understanding inter-skyrmion interactions across scales is crucial for device applications.
• Controlling atomic-scale skyrmions requires consideration of both magnetic interactions and lattice effects.