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MA: Fachverband Magnetismus

MA 10: INNOMAG e.V. Prizes 2026 (Diplom-/Master and Ph.D. Thesis)

MA 10.6: Hauptvortrag

Montag, 9. März 2026, 17:10–17:35, POT/0112

Altermagnets and Odd-parity-wave Magnets — •Anna Birk Hellenes — Institute of Physics of the Czech Academy of Sciences

The discovery of altermagnets was enabled by an unorthodox symmetry framework, spin groups, allowing to classify all collinear magnetic orders [1]. This raises the questions of whether (i) altermagnetism can be verified experimentally, (ii) new magnets with unknown symmetries can be realized, and (iii) whether they can be useful for spintronics.

In my thesis, I have contributed to answering these questions affirmatively. In this talk, I will review altermagnetic symmetries [1], present our theory-experiment verification of altermagnetism [2-4], and show that it enables spintronics phenomena such as giant magnetoresistance effects [5]. I will then discuss our theoretical prediction that odd-parity-wave magnetism arises in noncentrosymmetric, noncollinear magnets with a combined translation and time-reversal symmetry [6]. Contrary to common assumptions, they host non-relativistic spin-split electronic bands while preserving time-reversal symmetry: unlike ferromagnets and altermagnets, which break it. Our work opens broad opportunities for exploring altermagnets and odd-parity-wave magnets with potential applications including giant magnetoresistance [5], transport anisotropy [6], and Edelstein [7] effects.

[1] Šmejkal et al. PRX 12, 031042 (2022), [2] Nature 626, 517-522 (2024), [3] Nat. Comm. 15, 2116 (2024), [4] arXiv:2511.01690, [5] Šmejkal, ABH & Jungwirth et al. PRX 12, 011028 (2022), [6] ABH & Šmejkal et al. arXiv:2309.01607, [7] Chakraborty, ABH & Sinova et al. arXiv:2411.16378.

Keywords: Altermagnetism; Odd-parity-wave magnetism; P-wave magnetism; Unconventional magnetism; Spintronics