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 20.3: Hauptvortrag
Mittwoch, 7. September 2022, 10:30–11:00, H37
Magnetic Bragg Ptychography Studies of Spin Caloritronic — •Dina Carbone1, Peng Li2, Stephan Geprägs3, Rudolf Gross3,4, Paul Evans5, Virginie Chamard6, and Dan Mannix7 — 1MAX IV Laboratory, Lund SE — 2Diamond Light Source, Didcot UK — 3Walther-Meißner-Institut, BAdW, Garching DE — 4Physik-Department, TUM, Garching DE — 5Univ. of Wisconsin, Madison USA — 6Institut Fresnel, Marseille FR — 7ESS, Lund SE & Institut Néel, Grenoble FR
Spin-caloritronics refer to a class of materials in which spin, charge and heat currents can be interconverted. This gives rise to diverse functional properties that offer a great potential towards a new generation of fast and low power consumption electronics. Advances in the design and understanding of future spintronic nanotechnologies require the development of state-of-the-art 3D magnetic characterisation tools.In particular, for crystalline magnetic materials grown at nano-scales, understanding the interdependence of their magnetic properties with crystal structure and strain is crucial.
We have developed a magnetic and structural microscopy based on scanning diffraction, by combining circular polarisation and focussing of the X-ray beam. This has revealed spin texture in prototype spin caloritronics device structures and its relation with crystal orientation down to micron resolution[1]. New results obtained with coherent X-rays, using magnetic Bragg ptychography, push this technique towards a 3D spin microscopy with a resolution of few tens of nm.
[1] Evans et al., Sci. Adv. 6, eaba935, 2020