title: Large anomalous Hall effect driven by a nonvanishing Berry curvature in the noncolinear antiferromagnet Mn3Ge.
abstract: It is well established that the anomalous Hall effect displayed by a ferromagnet scales with its magnetization. Therefore, an antiferromagnet that has no net magnetization should exhibit no anomalous Hall effect. We show that the noncolinear triangular antiferromagnet Mn3Ge exhibits a large anomalous Hall effect comparable to that of ferromagnetic metals; the magnitude of the anomalous conductivity is ~500 (ohm·cm)(-1) at 2 K and ~50 (ohm·cm)(-1) at room temperature. The angular dependence of the anomalous Hall effect measurements confirms that the small residual in-plane magnetic moment has no role in the observed effect except to control the chirality of the spin triangular structure. Our theoretical calculations demonstrate that the large anomalous Hall effect in Mn3Ge originates from a nonvanishing Berry curvature that arises from the chiral spin structure, and that also results in a large spin Hall effect of 1100 (ħ/e) (ohm·cm)(-1), comparable to that of platinum. The present results pave the way toward the realization of room temperature antiferromagnetic spintronics and spin Hall effect-based data storage devices.
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany.; Max Planck Institute of Microstructure Physics, Weinberg 2, D-06120 Halle, Germany.
authors.forename: Ajaya K
authors.initials: AK
authors.lastname: Nayak
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany.
authors.forename: Julia Erika
authors.identifier: 0000-0002-6228-4817
authors.initials: JE
authors.lastname: Fischer
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany.
authors.forename: Yan
authors.initials: Y
authors.lastname: Sun
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany.
authors.forename: Binghai
authors.identifier: 0000-0003-2164-5839
authors.initials: B
authors.lastname: Yan
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany.
authors.forename: Julie
authors.initials: J
authors.lastname: Karel
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany.
authors.forename: Alexander C
authors.initials: AC
authors.lastname: Komarek
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany.
authors.forename: Chandra
authors.initials: C
authors.lastname: Shekhar
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany.
authors.forename: Nitesh
authors.initials: N
authors.lastname: Kumar
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany.
authors.forename: Walter
authors.initials: W
authors.lastname: Schnelle
authors.affiliation: Institut für Festkörperphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany.
authors.forename: Jürgen
authors.initials: J
authors.lastname: Kübler
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany.
authors.forename: Claudia
authors.initials: C
authors.lastname: Felser
authors.affiliation: Max Planck Institute of Microstructure Physics, Weinberg 2, D-06120 Halle, Germany.
authors.forename: Stuart S P
authors.initials: SS
authors.lastname: Parkin
mesh_terms: D005857:Germanium / Q000737:chemistry*; D059346:Magnets / Q000737:chemistry*; D008345:Manganese / Q000737:chemistry*; D015394:Molecular Structure
chemical_list: D005857:Germanium; D008345:Manganese
keywords: Spintronics; anomalous Hall effect; antiferromagnet