Probing the anomalous Hall transport and magnetic reversal of quasi-two-dimensional antiferromagnet Co<sub>1/3</sub>NbS<sub>2</sub>.
basic_science · Level V
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- Record sourced from PubMed, PMID 40368892.
- Also identified by DOI 10.1038/s41467-025-59690-6 and PMC identifier 12078648.
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Abstract
The recent discovery of anomalous Hall effect (AHE) in non-collinear antiferromagnets offers a promising platform for developing ultra-compact, ultrafast, and low-power antiferromagnetic spintronics, as well as for the in-depth investigation of topological physics. One notable example is the quasi-two-dimensional antiferromagnet Co<sub>1/3</sub>NbS<sub>2</sub>, which exhibits a large spontaneous Hall effect with compensated magnetization. Here, we report the observation of a large spontaneous Nernst effect in exfoliated Co<sub>1/3</sub>NbS<sub>2</sub> flakes. By analyzing the temperature- and field-dependent thermoelectric and transport phenomena, we confirm the intrinsic k-space Berry curvature as the origin of the spontaneous Hall effect. Reflective magnetic circular dichroism measurements further reveal the presence of non-collinear antiferromagnetic domains in Co<sub>1/3</sub>NbS<sub>2</sub>. Combined with electrical transport measurements, we elucidate the distinct magnetic reversal mechanisms between bulk and exfoliated samples. Our study provides a comprehensive phenomenological understanding of the magnetic and transport properties of Co<sub>1/3</sub>NbS<sub>2</sub>, laying the groundwork for further exploration of the underlying physics and potential applications of two-dimensional non-collinear magnets.