Three-Dimensional Spin Textures: From the Bulk to Patterned Nanostructures

Abstract:

Three-dimensional magnetic systems promise significant opportunities for applications, for example providing higher-density devices and new functionalities associated with complex topology and greater degrees of freedom [1,2]. With recent advances in both characterization and nanofabrication techniques, the experimental investigation of these complex systems is now possible, opening the door to the elucidation of new physical properties, and representing the first steps towards higher-dimensional magnetic devices.

In this seminar I will speak about our work on the characterization of 3D nanomagnetic systems with x-ray magnetic tomographic techniques [3,4,5]. In this way, both the static configuration [3,5], and dynamical behaviour [4,6], of topological structures within the bulk of a system [3,4,7], as well as in nanoscale structures [5,6,8] have been revealed. Within these complex configurations, recent advances in analytical techniques [7] have provided new capabilities to locate and identify 3D magnetic solitons, leading to the first observation of nanoscale magnetic vortex rings [7,9].

As well as existing within bulk and thin film systems, 3D spin textures can be introduced via the patterning of complex 3D magnetic nanostructures [10], leading to the realisation of highly coupled curvilinear systems [8]. These new experimental capabilities for 3D magnetic systems open the door to complex three-dimensional magnetic structures, and their dynamic behaviour.

[1] Fernández-Pacheco et al., Nature Communications 8, 15756 (2017).
[2] C. Donnelly and V. Scagnoli, J. Phys. D: Cond. Matt. 32, 213001 (2020).
[3] C. Donnelly et al., Nature 547, 328 (2017).
[4] C. Donnelly et al., Nature Nanotechnology 15, 356 (2020).
[5] K. Witte, et al., Nano Letters 20, 1305 (2020).
[6] S. Finizio et al., Nano Letters (2022).
[7] C. Donnelly et al., Nat. Phys. 17, 316 (2020).
[8] C. Donnelly et al., Nature Nanotechnology 17, 136 (2022).
[9] N. Cooper, Phys. Rev. Lett. 82, 1554 (1999).
[10] L. Skoric et al., Nano Letters 20, 184 (2020).

Room: REC/C213

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