SKM 2021 – scientific programme

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SYCL: Symposium Curvilinear condensed matter

SYCL 2: Curvilinear condensed matter 2

SYCL 2.3: Invited Talk

Wednesday, September 29, 2021, 12:15–12:45, Audimax 2

X-ray three-dimensional magnetic imaging — •Valerio Scagnoli — Laboratory for Mesoscopic Systems, Department of Materials, ETH Zurich, Zurich, Switzerland — Paul Scherrer Institute, Villigen, 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 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)