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MA: Fachverband Magnetismus

MA 47: Altermagnets III

MA 47.1: Vortrag

Freitag, 21. März 2025, 09:30–09:45, H20

Growth and spectroscopy of altermagnetic MnTe — •Marco Dittmar, Lena Hirnet, Hannes Haberkamm, Maximilian Ünzelmann, and Friedrich Reinert — Exp. Physik VII and Würzburg-Dresden Cluster of Excellence ct.qmat, Universität Würzburg, Germany

As a new type of fundamental magnetic order next to ferro- and antiferromagnetism, altermagnetism has recently attracted great attention [1]. It is characterized by antiferromagnetic spin alignment combined with rotational lattice symmetry, which results in a momentum-dependent spin-split band structure with spin polarized electronic states. One of the "workhorse" materials potentially exhibiting this type of magnetic order is MnTe in its hexagonal NiAs-type crystal structure [1,2]. Here, we investigate MnTe thin films grown by molecular beam epitaxy. The high film quality is confirmed by structural characterization methods, while we assess the three-dimensional bulk band structure using soft X-ray angle-resolved photoemission spectroscopy. The experimentally observed spectral features agree well with band structure calculations and — based on that — the possible occurance of the characteristic momentum-dependent spin splitting will be discussed.

[1] L. Šmejkal et al., Phys. Rev. X 12, 031042 (2022)

[2] J. Krempaský et al., Nature 626, 517-522 (2024)

Keywords: Altermagnetism; MBE growth; MnTe; Spectroscopy