Bimerons as Edge States in Thin Magnetic Strips.

Area of Science:

• Spintronics
• Condensed Matter Physics
• Materials Science

Background:

• Magnetic bimerons are topologically equivalent to skyrmions and are promising for spintronic devices.
• Current-driven motion of bimerons is typically limited by the bimeron Hall effect, leading to transverse motion and annihilation.

Purpose of the Study:

• To investigate a novel mechanism for stabilizing bimeron propagation in current-driven systems.
• To explore conditions for annihilation-free bimeron movement in ferromagnetic strips.

Main Methods:

• Theoretical investigation of bimeron dynamics in thin ferromagnetic strips.
• Analysis of bimeron behavior under specific conditions of easy-axis anisotropy and electric current orientation.
• Simulation of bimeron propagation in straight, curved, and chain configurations.

Main Results:

• Bimerons can propagate without annihilation along ferromagnetic strips when easy-axis anisotropy and electric current are orthogonal.
• A 6-fold increase in bimeron velocity is observed near strip edges due to boundary interactions.
• Bimerons exhibit stable propagation in curved geometries and in parallel chains.

Conclusions:

• A new mechanism stabilizes bimeron propagation, overcoming limitations of the bimeron Hall effect.
• The findings demonstrate the potential for bimeron-based racetrack memory technologies.
• Orthogonal anisotropy and current offer a pathway for efficient and robust bimeron-based information transport.