Phase shift in skyrmion crystals

Area of Science:

• Condensed Matter Physics
• Materials Science
• Spintronics

Background:

• Magnetic skyrmion crystals are periodic topological spin textures formed by interfering helical spin density waves.
• The phase degree of freedom in these waves influences magnetic and transport properties, but its effects remain largely unexplored.

Purpose of the Study:

• To theoretically investigate the impact of phase shifts on magnetic skyrmion crystal textures.
• To explore the resulting spin textures and their associated transport phenomena, particularly nonreciprocal transport.

Main Methods:

• Theoretical modeling of magnetic skyrmion crystals with controlled phase shifts.
• Analysis of emergent spin textures, scalar spin chirality patterns, and transport properties.

Main Results:

• Phase shifts induce novel topological spin textures: tetra-axial vortex crystals and meron-antimeron crystals.
• These new textures exhibit staggered scalar spin chirality, leading to nonreciprocal transport phenomena.
• The phase shifts can be driven by exchange interactions, thermal fluctuations, and chirality interactions in spin-charge coupled systems.

Conclusions:

• Phase shift engineering offers a new pathway to diversify topological spin textures.
• This work establishes a foundation for emergent electromagnetism driven by phase shifts in magnetic materials.