Spin-Wave Driven Bidirectional Domain Wall Motion in Kagome Antiferromagnets

Area of Science:

• Condensed Matter Physics
• Materials Science
• Spintronics

Background:

• Antiferromagnetic materials offer potential for high-speed, low-power electronic devices.
• Controlling magnetic domain walls is crucial for device functionality.
• Kagome lattices exhibit unique magnetic properties.

Purpose of the Study:

• To predict and demonstrate a method for controllable domain wall manipulation in kagome antiferromagnets.
• To investigate the use of spin waves as a tool for domain wall control.
• To explore the potential for developing next-generation antiferromagnetic insulator devices.

Main Methods:

• Atomistic spin dynamics simulations of kagome antiferromagnets.
• Derivation of effective action and equations of motion for spin-wave-driven domain walls.
• Analytical calculations of spin-wave mode coupling within domain walls.

Main Results:

• Demonstrated controllable manipulation of domain walls using a single linearly polarized spin-wave source.
• Showed that spin wave frequency tuning precisely regulates domain wall speed and direction.
• Identified the coupling of two spin-wave modes as the mechanism for frequency-dependent velocity.

Conclusions:

• A novel, highly tunable method for spin-wave-induced domain wall motion in kagome antiferromagnets has been established.
• This control mechanism is key for developing fast, energy-efficient, and Joule-heating-free antiferromagnetic insulator devices.
• The findings pave the way for advanced spintronic applications.