Regensburg 2022 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 20: Focus Session: Revealing Multidimensional Spin Textures and their Dynamics via X-rays and Electrons

MA 20.1: Hauptvortrag

Mittwoch, 7. September 2022, 09:30–10:00, H37

Recent developments in X-ray three-dimensional magnetic imaging — •Valerio Scagnoli — ETHZ - PSI

Three dimensional magnetic systems hold the promise to provide new functionality associated with greater degrees of freedom. Over the last years we have worked towards developing methods to fabricate and characterize three dimensional magnetic structures. Specifically, we have combined X-ray magnetic imaging with new iterative reconstruction algorithms to achieve X-ray magnetic tomography and laminography [1-4]. In a first demonstration, we have determined the three-dimensional magnetic nanostructure within the bulk of a soft GdCo2 magnetic micropillar and we have identified the presence of Bloch points of different types [1] as well as three-dimensional structures forming closed vortex loops [3]. Subsequently, we have used the flexibility provided by the laminography geometry to perform time resolved measurements of the magnetization dynamics in a two-phase micrometer size GdCo disk. Therefore, X-ray magnetic three-dimensional imaging, with its recent extension to the soft X-ray regime [5], has now reached sufficient maturity that will enable to unravel complex three-dimensional magnetic structures for a range of magnetic systems.

[1] C. Donnelly et al., Nature 547, 328 (2017)

[2] C. Donnelly et al., New J. Phys. 20, 083009 (2018)

[3] C. Donnelly et al., Nat. Phys. 17, 316 (2021)

[4] C. Donnelly et al., Nat. Nanotechnol. 15, 356 (2020)

[5] K. Witte et al., Nano Letters 20, 1305 (2020)