Dresden 2026 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 6: Magnetic Imaging Techniques I

MA 6.10: Vortrag

Montag, 9. März 2026, 12:00–12:15, POT/0361

Nanoscale mapping of magnetic orientations with complex x-ray magnetic linear dichroism — •Marina Raboni-Ferreira^1,2, Benedikt J. Daurer³, Jeffrey Neethirajan¹, Andreas Apseros^4,5, Sandra Ruiz-Gómez^1,6, Burkhard Kaulich³, Majid Kazemian³, and Claire Donnelly^1,7 — ¹MPI CPfS, Dresden, Germany — ²UNICAMP, Campinas, Brazil — ³DLS, Didcot, UK — ⁴ETH, Zurich, Switzerland — ⁵PSI, Villigen, Switzerland — ⁶ALBA, Barcelona, Spain — ⁷WPI-SKCM2, Hiroshima, Japan

Compensated magnets are of increasing interest for both fundamental research and applications, as their net-zero magnetization enables ultrafast dynamics and robust order. To understand and control this order, nanoscale mapping of local domain structures is essential. Here, we combine X-ray magnetic linear dichroism (XMLD), a spectroscopic technique sensitive to the local Néel-vector orientation, with ptychography, a coherent X-ray imaging technique, to obtain high-resolution images of in-plane magnetic orientations in a model sample exhibiting a Landau pattern. By combining these techniques with an unsupervised machine learning approach, we retrieve the full complex XMLD spectrum of the sample, and map its magnetic domains with sub-100-nm resolution. Our results show that phase contrast is significantly stronger than the corresponding absorption contrast, offering higher spatial resolution imaging. This establishes phase contrast as a high-resolution mechanism for mapping magnetic orientations and paves the way toward higher-dimensional X-ray imaging, including Néel-vector orientation tomography of antiferromagnets.

Keywords: X-ray Magnetic Linear Dichroism; X-ray Ptychography; X-ray Microscopy