# Current Switching of Topological Spin Chirality in the van der Waals Antiferromagnet Co1/3TaS2

## TL;DR

Researchers demonstrated how to electrically switch spin chirality in a new magnetic material, opening possibilities for chiral spintronics and quantum technologies.

## Contribution

The discovery of current-induced spin chirality switching in Co1/3TaS2 without external magnetic fields or heavy metals.

## Key findings

- Co1/3TaS2 hosts a topological 3Q state with high skyrmion density and non-centrosymmetric geometry.
- Current-driven self-torque enables efficient chirality switching without magnetic fields or heavy metals.
- The method offers a scalable framework for manipulating topological spin states in quantum systems.

## Abstract

Magnetic topology is central to modern quantum magnet, where spin chirality governs exotic spin winding, real‐space Berry phase, and topological Hall effect. A key unresolved challenge is how to electrically switch topological spin chirality and its associated gauge flux, an essential requirement for manipulating its topological quantum properties. In this work, we propose and experimentally demonstrate the concept of current‐switching spin chirality. We identify the new vdW antiferromagnet Co1/3TaS2 as an ideal platform, hosting a topological 3Q state with a minimum chirality cell, an ultrahigh skyrmion density, a non‐centrosymmetric geometry, and a strong Berry curvature. We discover intrinsic self‐torque‐induced chirality switching within Co1/3TaS2, driven purely by current, without the need for heavy metals or a magnetic field, and with high energy efficiency. Our results establish a promising framework for electrically generating and controlling topological spin chirality, and demonstrate a practical route toward chiral spintronics. They can be naturally generalized to other skyrmion systems, offering new opportunities in symmetry control, topological manipulation, and spin‐chirality–based quantum functionalities.

Spin chirality plays a central role in quantum magnetism, governing spin winding and generating real‐space Berry phases. We propose the intriguing concept of current‐switching spin chirality and demonstrate it via unconventional intrinsic self‐spin‐orbit‐torque in pristine Co1/3TaS2, purely by electrical current and with high energy efficiency. This route establishes new and extendable frameworks for creating, controlling, and exploiting topological spin chirality.