Bimerons as Edge states in Thin Magnetic Strips

TL;DR

This paper demonstrates that bimerons can stably propagate in thin magnetic strips under specific conditions, overcoming previous challenges like the bimeron Hall effect, and enabling their potential use in spintronic racetrack memory devices.

Contribution

It introduces a method to stabilize bimeron propagation in ferromagnetic strips by orthogonal alignment of anisotropy and current, preventing annihilation and enabling long-distance transport.

Findings

Stable bimeron propagation achieved below a current threshold.

Orthogonal anisotropy and current prevent bimeron annihilation.

Bimeron chains can move parallel to current flow in bent regions.

Abstract

Magnetic bimerons are potential information carriers in spintronic devices. Bimerons, topologically equivalent to skyrmions, manifest in chiral magnetic systems with in-plane magnetization due to anisotropies or external magnetic fields. Applications demanding their current-driven motion face significant challenges, notably the bimeron Hall effect, which causes transverse movement and annihilation at nanomagnet borders. This study addresses the problem of stabilizing bimeron propagation under current-driven conditions. We demonstrate that bimerons can propagate through thin ferromagnetic strips without annihilation when the easy-axis anisotropy and the electric current are orthogonal. Our findings indicate that below a threshold value of current, the repulsion between the bimeron and the strip boundary allows for stable soliton propagation, even in bent regions. This phenomenon extends to bimeron chains, which propagate parallel to the current flow. By enabling stable long-distance propagation, our results open new avenues for developing bimeron-based racetrack memory devices, enhancing the efficiency and reliability of future spintronic applications.