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<p>The topological Hall effect (THE) is a hallmark of a non-trivial geometric spin arrangement in a magnetic metal, originating from a finite scalar spin chirality (SSC). The associated Berry phase is often a consequence of non-coplanar magnetic structures identified by multiple <b>k</b>-vectors. For single - <b>k</b> magnetic structures however with zero SSC, the emergence of a finite topological Hall signal presents a conceptual challenge. Here, we report that a fluctuation-driven mechanism involving chiral magnons is responsible for the observed THE in a low-symmetry compound, monoclinic Fe<sub>3</sub>Ga<sub>4</sub>. Through neutron scattering experiments, we discovered several nontrivial magnetic phases in this system. In our focus is the helical spiral phase at room temperature, which transforms into a transverse conical state in applied magnetic field, supporting a significant THE signal up to and above room temperature. Our work offers a fresh perspective in the search for novel materials with intertwined topological magnetic and transport properties.</p>

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Fluctuation-driven topological Hall effect in room-temperature itinerant helimagnet Fe3Ga4

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年4月24日

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  • Priya R. Baral,
  • Victor Ukleev,
  • Ivica Živković,
  • Youngro Lee,
  • Fabio Orlandi,
  • Pascal Manuel,
  • Yurii Skourski,
  • Lukas Keller,
  • Anne Stunault,
  • J. Alberto Rodríguez-Velamazán,
  • Robert Cubitt,
  • Arnaud Magrez,
  • Jonathan S. White,
  • Igor I. Mazin,
  • Oksana Zaharko

摘要

The topological Hall effect (THE) is a hallmark of a non-trivial geometric spin arrangement in a magnetic metal, originating from a finite scalar spin chirality (SSC). The associated Berry phase is often a consequence of non-coplanar magnetic structures identified by multiple k-vectors. For single - k magnetic structures however with zero SSC, the emergence of a finite topological Hall signal presents a conceptual challenge. Here, we report that a fluctuation-driven mechanism involving chiral magnons is responsible for the observed THE in a low-symmetry compound, monoclinic Fe3Ga4. Through neutron scattering experiments, we discovered several nontrivial magnetic phases in this system. In our focus is the helical spiral phase at room temperature, which transforms into a transverse conical state in applied magnetic field, supporting a significant THE signal up to and above room temperature. Our work offers a fresh perspective in the search for novel materials with intertwined topological magnetic and transport properties.