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Seminarium Fizyki Ciała Stałego i Seminarium ACMiN: "Revealing magnetic configurations with X-ray magnetic tomography"
Środa, 17. Październik 2018, 09:00

Uprzejmie zapraszamy na Środowiskowe Seminarium Fizyki Ciała Stałego i Seminarium ACMiN, które odbędzie się w środę 17 października 2018r. o godz. 9.00 w Sali Audytoryjnej ACMiN AGH na II piętrze budynku D-16 (ul. Kawiory 30).

Referat pod tytułem "Revealing magnetic configurations with X-ray magnetic tomography
" wygłosi Dr. Valerio Scagnoli (Mesoscopic Systems, ETH Zurich - Paul Scherrer Institute, Villigen PSI, Szwajcaria).

Streszczenie:

Three dimensional magnetic systems hold the promise to provide higher density devices and 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 buckyball and performed a high spatial resolution tomographic characterisation of the structural and elemental properties [1]. 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 [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., Phys. Rev. Lett. 114, 115501 (2015) [2] C. Donnelly, et al., Phys. Rev. B 94, 064421 (2016) [3] C. Donnelly, et al., Nature 547, 328 (2017) [4] C. Donnelly, et al., New J. Phys. 20, 083009 (2018)

Miejsce Sala Audytoryjna ACMiN AGH (1.02A), na II piętrze pawilonu D-16 (ul. Kawiory 30)