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

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 and Oksana Zaharko ()
Additional contact information
Priya R. Baral: The University of Tokyo
Victor Ukleev: PSI Center for Neutron and Muon Sciences
Ivica Živković: École Polytechnique Fédérale de Lausanne (EPFL)
Youngro Lee: École Polytechnique Fédérale de Lausanne (EPFL)
Fabio Orlandi: Harwell Science and Innovation Campus
Pascal Manuel: Harwell Science and Innovation Campus
Yurii Skourski: Helmholtz-Zentrum Dresden-Rossendorf
Lukas Keller: PSI Center for Neutron and Muon Sciences
Anne Stunault: Institut Laue-Langevin
J. Alberto Rodríguez-Velamazán: Institut Laue-Langevin
Robert Cubitt: Institut Laue-Langevin
Arnaud Magrez: École Polytechnique Fédérale de Lausanne (EPFL)
Jonathan S. White: PSI Center for Neutron and Muon Sciences
Igor I. Mazin: George Mason University
Oksana Zaharko: PSI Center for Neutron and Muon Sciences

Nature Communications, 2025, vol. 16, issue 1, 1-9

Abstract: Abstract 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.

Date: 2025
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DOI: 10.1038/s41467-025-58933-w

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