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<p>The anomalous Hall angle (<i>θ</i><sup>A</sup>) is a measure of the efficiency of converting a longitudinal driving current into a transverse spin-polarized Hall current. In sensors based on the anomalous Hall effect, a large anomalous Hall angle can improve the sensitivity of magnetic field detection. However, the modulation of this angle is challenging, and magnetic materials typically have low angles of 0.1°–3°. Here we report the modulation of <i>θ</i><sup>A</sup> in the magnetic Weyl semimetal Co<sub>3</sub>Sn<sub>2</sub>S<sub>2</sub>. We show that the anomalous Hall angle parameter tan<i>θ</i><sup>A</sup> can be formulated as a function of the product of electrical resistivity and anomalous Hall conductivity. We use this scheme to demonstrate the modulation of tan<i>θ</i><sup>A</sup> up to a magnitude of 0.46, corresponding to an angle of around 25°. We further fabricate anomalous Hall devices using Fe-doped Co<sub>3</sub>Sn<sub>2</sub>S<sub>2</sub> single-crystalline nanoflakes and demonstrate a Hall sensitivity of 7,028 ± 341 μΩ cm T<sup>–1</sup> and a magnetic field detectability of 23.5 ± 1.7 nT Hz<sup>–0.5</sup> at 1 Hz.</p>

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Modulation of the anomalous Hall angle in a magnetic topological semimetal

  • 期刊论文

  • 发表日期：

    2025年4月2日

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  • Jinying Yang,
  • Yanxing Shang,
  • Xingchen Liu,
  • Yibo Wang,
  • Xuebin Dong,
  • Qingqi Zeng,
  • Meng Lyu,
  • Shen Zhang,
  • Yang Liu,
  • Binbin Wang,
  • Hongxiang Wei,
  • Yizheng Wu,
  • Stuart Parkin,
  • Gangqin Liu,
  • Claudia Felser,
  • Enke Liu,
  • Baogen Shen

摘要

The anomalous Hall angle (θA) is a measure of the efficiency of converting a longitudinal driving current into a transverse spin-polarized Hall current. In sensors based on the anomalous Hall effect, a large anomalous Hall angle can improve the sensitivity of magnetic field detection. However, the modulation of this angle is challenging, and magnetic materials typically have low angles of 0.1°–3°. Here we report the modulation of θA in the magnetic Weyl semimetal Co3Sn2S2. We show that the anomalous Hall angle parameter tanθA can be formulated as a function of the product of electrical resistivity and anomalous Hall conductivity. We use this scheme to demonstrate the modulation of tanθA up to a magnitude of 0.46, corresponding to an angle of around 25°. We further fabricate anomalous Hall devices using Fe-doped Co3Sn2S2 single-crystalline nanoflakes and demonstrate a Hall sensitivity of 7,028 ± 341 μΩ cm T–1 and a magnetic field detectability of 23.5 ± 1.7 nT Hz–0.5 at 1 Hz.