Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 3: Focus Session: Novel 3D magnetic spin textures

MA 3.7: Hauptvortrag

Montag, 1. April 2019, 12:15–12:45, H38

Revealing magnetic configurations with X-ray magnetic nanotomography — •Valerio Scagnoli — Laboratory for Mesoscopic Systems, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland — Laboratory for Multiscale Materials Experiments, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland

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 characterise three dimensional magnetic structures. Specifically, we have fabricated an artificial magnetic In order to determine the magnetic configuration in such three dimensional systems, we have combined X-ray magnetic imaging with a new iterative reconstruction algorithm to achieve X-ray magnetic tomography [1,2,3]. In a first demonstration, we determine the three dimensional magnetic nanostructure within the bulk of a soft GdCo2 magnetic micropillar, observing a complex magnetic configuration consisting of vortices and antivortices that form cross-tie and vortex walls. By determining the magnetic structure surrounding singularity points found at the intersections of these magnetic structures we have identified the presence of Bloch points of different types [3]. X-ray magnetic nanotomography will enable to unravel complex three dimensional magnetic structures for a range of magnetic systems with high spatial resolution [4].

[1] C. Donnelly et al., PRL 114, 115501 (2015) [2] C. Donnelly et al., PRB 94, 064421 (2016) [3] C. Donnelly et al., Nature 547, 328 (2017) [4] C. Donnelly et al., New J. Phys. 20, 083009 (2018).