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MA: Fachverband Magnetismus
MA 8: Altermagnets II
MA 8.13: Vortrag
Montag, 9. März 2026, 18:15–18:30, HSZ/0002
Relativistically Distinct Altermagnetic States in α-Fe2O3 by X-ray Spectromicroscopy — •Rikako Yamamoto1,2, Sina Mayr3,4, Atsushi Hariki5, Simone Finizio3, Eugen Weschke6, Markus Weigand6, Libor Šmejkal7, Jan Kuneš8, Claire Donnelly1,2, and Sebastian Wintz6 — 1MPI-CPfS, Dresden Germany — 2WPI-SKCM2 Hiroshima University, Hiroshima, Japan — 3PSI, Villigen, Switzerland — 4ETH, Zürich, Switzerland — 5Osaka Metropolitan University, Osaka, Japan — 6HZB, Berlin, Germany — 7MPI-PKS, Dresden, Germany — 8Masaryk University, Kotlářská, Czech Republic
In this study, we demonstrate the altermagnetic nature of α-Fe2O3 using x-ray magnetic linear and circular dichroism (XMLD and XMCD) spectroscopy and imaging. We observed an oscillatory XMCD signal for the x-ray beam along the c-axis, perpendicular to the net magnetization due to canting, which originates purely from altermagnetism.
Although the XMCD signal vanishes below the Morin reorientation transition as dictated by symmetry, we show that the x-ray absorption (XAS) alone provides sufficient contrast allowing to distinguish in- and out-of-plane orientations of the Néel vector. By combining the XMCD, XMLD and XAS contrast, we map out the continuous three-dimensional variation of the Néel vector in our samples. This approach can be broadly applied to a wide range of other materials.
Keywords: Altermagnet; X-ray