Large anomalous Hall effect driven by a nonvanishing Berry curvature in the noncolinear antiferromagnet Mn3Ge
By A. Nayak, J. Fischer, Yan Sun, Binghai Yan, J. Karel, A. Komarek, C. Shekhar, W. Schnelle, J. Kübler, Claudia Felser and 1 more. Science Advances, 2015
836 citations recorded by the source corpus.
A large anomalous Hall effect is observed in the triangular antiferromagnet Mn3Ge arising from an intrinsic electronic Berry phase. 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.
Subfields: Atomic and Molecular Physics, and Optics, Condensed Matter Physics
View Paper: https://www.semanticscholar.org/paper/e192776fea44932a330383e76d97f92299329860
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In Atomic and Molecular Physics, and Optics
- Claudia Felser
- Stuart S. P. Parkin
- A. Nayak
- Lukas Wollmann
- A. Bostwick
- Eli Rotenberg
- Junwei Liu
- Liang Fu
In Condensed Matter Physics
Citations in the corpus
- Beyond skyrmions: Review and perspectives of alternative magnetic quasiparticles (2020, background): “However, as discussed earlier, the anomalous Hall effect has even been observed in coplanar systems without a net magnetization [94, 95], depending on the system’s symmetry.”
- Heusler 4.0: Tunable Materials (2016, methodology): “(127) Our theoretical predictions were supported by measuring the experimental AHE in Mn3Ge, as shown in Figure 11 (c) and (d).”