Regensburg 2025 – scientific programme

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TUT: Tutorien

TUT 3: Tutorial: Into the Third (and Fourth) Dimension: Imaging Methods for 3D Nanomagnetism (joint session MA/TUT)

TUT 3.1: Tutorial

Sunday, March 16, 2025, 16:00–16:45, H4

3D Magnetic Imaging: Utilizing Synchrotron X-Ray Coherence for Nanometric Resolution in Thick Samples — •Marisel Di Pietro Martinez — Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany — International Institute for Sustainability with Knotted Chiral Meta Matter (WPI-SKCM2)

In recent years, there has been a growing interest from the magnetism community in expanding to three-dimensional magnetic systems - from exploring new geometries to revealing complex magnetic textures arising in micrometer-thick samples. A key aspect of this exploration is the ability to visualize the magnetization vector field at the nanoscale throughout the entire sample, made possible by the development of 3D magnetic imaging. This technique can achieve nanometric spatial resolution in micrometer-thick samples by leveraging the penetration depth and coherence of synchrotron X-rays. Furthermore, the coherence of the X-ray beam provides magnetic contrast not only in the absorption of the transmitted wave, but also in the phase. This phase contrast enables the investigation of micron-sizes magnets, even with soft X-rays, while minimizing the sample damage. In this tutorial, I will introduce how to exploit these advantages using coherence-based techniques, such as Fourier transform holography and ptychography, to perform 3D magnetic imaging. Visualizing the magnetization vector field with nanometer spatial resolution in micrometer thick samples opens the door to studying magnetic textures in higher dimensions, offering insights into fundamental physical phenomena as well as promising new applications in information storage and processing.

Keywords: nanomagnetism; X-ray; microscopy; tomography; imaging