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MA: Fachverband Magnetismus

MA 13: Altermagnets II

MA 13.4: Vortrag

Dienstag, 18. März 2025, 10:15–10:30, H20

Altermagnetic properties of hematite. — •Edgar Galindez-Ruales¹, Rafael Gonzales-Hernandez^1,2, Gerhard Jakob¹, and Mathias Kläui¹ — ¹Institute of Physics, Johannes Gutenberg University Mainz, Staudingerweg 7, 55128 Mainz, Germany. — ²Grupo de Investigacíon en Física Aplicada, Departamento de Física,Universidad del Norte, Barranquilla, Colombia.

Hematite, a prototypical antiferromagnet, has emerged as a promising altermagnet due to its unique magnetic and electronic properties[1]. Unlike conventional antiferromagnets, altermagnets exhibit a nonzero anomalous Hall effect (AHE) due to symmetry-breaking electronic structures despite having no net magnetization. In hematite, we observe anisotropic magnetotransport with a strong crystal orientation dependence, including a striking sign inversion in the Hall effect[2]. Using advanced XMCD and XMLD imaging, we directly visualize and distinguish 180^∘ domains, confirming the interplay between collinear antiferromagnetism and non-centrosymmetric atomic arrangements that drive the altermagnetic behavior. These findings provide robust experimental evidence of hematite*s altermagnetic nature, offering new mechanisms for identifying altermagnetic candidates and establishing hematite as a model system for exploring altermagnetic phenomena. This work paves the way for utilizing altermagnetic materials in spintronic applications, revolutionizing our understanding of magnetic material classification and transport phenomena. [1] L. Šmejkal et al., PRX 12, 040501 (2022). [2] E. Galindez-Ruales et al., ArXiv:2310.16907 (2023).

Keywords: Altermagnetism, hematite, X-PEEM