Strongly Enhanced Lifetime of Higher-Order Bimerons and Antibimerons

Area of Science:

• Spintronics
• Condensed Matter Physics
• Materials Science

Background:

• Topologically nontrivial spin textures like magnetic bimerons and skyrmions are crucial for advanced magnetic devices.
• Previous research primarily focused on low-topological-charge (low-Q) magnetic solitons (|Q| ≤ 1).

Purpose of the Study:

• To investigate the stability and lifetimes of ring-like high-Q bimerons.
• To compare the stability of high-Q bimerons with high-Q skyrmions.
• To explore the influence of temperature and magnetic texture symmetry on soliton lifetimes.

Main Methods:

• First-principles calculations of magnetic soliton lifetimes.
• Utilizing an experimentally feasible van der Waals interface (Fe3GeTe2/Cr2Ge2Te6).
• Analyzing the role of topological charge (Q) and magnetic texture symmetry.

Main Results:

• Ring-like high-Q bimerons exhibit fundamentally greater stability than high-Q skyrmions.
• Lifetimes of high-Q bimerons can surpass those of |Q|=1 bimerons by three orders of magnitude.
• This enhanced stability persists at room temperature due to entropy dominance, unlike high-Q skyrmions.

Conclusions:

• High-Q bimerons offer superior stability compared to high-Q skyrmions, particularly at higher temperatures.
• Distinct magnetic texture symmetries between bimerons and skyrmions dictate their entropy-dominated lifetimes.
• The findings suggest high-Q bimerons as promising candidates for robust spintronic applications.