Metallic antiferromagnets with broken inversion symmetry on the two sublattices, strong spin-orbit coupling, and high Néel temperatures offer alternative opportunities for applications in spintronics. Especially Mn2Au, with a high Néel temperature and high conductivity, is particularly interesting for real-world applications. Here, manipulation of the orientation of the staggered magnetization, (i.e., the Néel vector) by current pulses was recently demonstrated, with the readout limited to studies of anisotropic magnetoresistance or x-ray magnetic linear dichroism. Here we report on the in-plane reflectivity anisotropy of Mn2Au(001) films, which are Néel vector aligned in pulsed magnetic fields. In the near-infrared region, the anisotropy is approximately 0.6%, with higher reflectivity for the light polarized along the Néel vector. The observed magnetic linear dichroism is about 4 times larger than the anisotropic magnetoresistance. This suggests the dichroism in Mn2Au is a result of the strong spin-orbit interactions giving rise to anisotropy of interband optical transitions, which is in line with recent studies of electronic band structure. The considerable magnetic linear dichroism in the near-infrared region could be used for ultrafast optical readout of the Néel vector in Mn2Au.
KAUST Repository Item: Exported on 2021-08-19
Acknowledged KAUST grant number(s): OSR-2019-CRG8-4048
Acknowledgements: This work was funded by the Deutsche Forschungsgemeinschaft (DFG) under Grant No. TRR 173 268565370 (Project A05, with additional contributions from A01). It received support from the Horizon 2020 framework program of the European Commission under Grant Agreement No. 863155 (S-NEBULA) and KAUST (OSR-2019-CRG8-4048). V.G. and M.F. acknowledge financial support from the Graduate School of Excellence “Materials Science in Mainz” (DFG Grant No. GSC 266 49741853). We acknowledge the Paul Scherrer Institut, Villigen, Switzerland, for the beamtime allocation under proposal 20200977 at the SIM beamline of the Swiss Light Source. We thank the SIM beamline staff for technical support. We acknowledge valuable discussions with H.-J. Elmers, H. Gomonay, P. Grigorev, and L. Šmejkal.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.
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