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<p>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 <i>k</i>-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.</p>

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Probing the anomalous Hall transport and magnetic reversal of quasi-two-dimensional antiferromagnet Co1/3NbS2

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年5月14日

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  • Pingfan Gu,
  • Yuxuan Peng,
  • Shiqi Yang,
  • Huan Wang,
  • Shenyong Ye,
  • Hanwen Wang,
  • Yanping Li,
  • Tianlong Xia,
  • Jinbo Yang,
  • Yu Ye

摘要

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 Co1/3NbS2, which exhibits a large spontaneous Hall effect with compensated magnetization. Here, we report the observation of a large spontaneous Nernst effect in exfoliated Co1/3NbS2 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 Co1/3NbS2. 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 Co1/3NbS2, laying the groundwork for further exploration of the underlying physics and potential applications of two-dimensional non-collinear magnets.