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

Mittwoch, 7. September 2022, 09:30–13:00, H37

Non-collinear spin textures in magnetic materials and excitations within such spin arrangements moved into the focus of research. These system host topological spin states and unique excitations providing access to versatile future spintronic applications. The imaging of such complex internal magnetic orders of materials is a fundamental problem of extreme importance for the successful implementation of these applications. Characterizing the electronic, magnetic and transport properties of structures such as vortices, magnetic singularities or hopfions lead to the development of novel experimental and theoretical techniques. For instance, magnetic hopfions have been unveiled via a combination of X-ray photoemission electron microscopy and soft X-ray transmission microscopy using element-specific X-ray magnetic circular dichroism effects. Recently, time-resolved magnetic laminography enabled access to the temporal evolution of three-dimensional (3D) magnetic microdiscs with nanoscale resolution, while quantitative reconstruction of the 3D spintexture of skyrmions with sub-10 nm resolution was demonstrated by holographic vector field electron tomography or soft x-ray vector ptychography. Pivotal to these experimental developments are theoretical proposals for the detection and manipulation protocols. Although making a strong impact in the field of magnetism, this area of research calls for an in-depth exchange between experts of different techniques, experimental and theoretical, to unravel many of the open questions and puzzling behavior discovered within the last couple of years. This motivates the present focus session as an opportunity for discussions and to attract more researchers to this fascinating field. Organizers: Samir Lounis (Uni.Duisburg-Essen and FZ-Jülich) Matthias Althammer, Stephan Geprägs (Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching), Gisela Schütz (MPI-Intelligent systems, Stuttgart), Stefan Blügel (FZ-Jülich)

	09:30	MA 20.1	Hauptvortrag: Recent developments in X-ray three-dimensional magnetic imaging — •Valerio Scagnoli
	10:00	MA 20.2	Hauptvortrag: Magnetic depth profiling with x-ray resonant magnetic reflectivity (XRMR) — •Timo Kuschel
	10:30	MA 20.3	Hauptvortrag: Magnetic Bragg Ptychography Studies of Spin Caloritronic — •Dina Carbone, Peng Li, Stephan Geprägs, Rudolf Gross, Paul Evans, Virginie Chamard, and Dan Mannix
	11:00		15 min. break
	11:15	MA 20.4	Hauptvortrag: Imaging the 3D magnetic texture of skyrmion tubes and approaches towards determining their Hall signature — •B. Rellinghaus, S. Schneider, D. Wolf, U.K. Rössler, M. Schmidt, A. Kovács, R.E. Dunin-Borkowski, D. Pohl, A. Thomas, D. Krieger, B. Büchner, and A. Lubk
	11:45	MA 20.5	Hauptvortrag: Determination of spin chirality and helicity angle by circular dichroism in soft x-ray absorption and resonant elastic scattering — •Gerrit van der Laan
	12:15	MA 20.6	Hauptvortrag: Identification of complex spin-textures by novel Hall effects — •Juba Bouaziz, Hiroshi Ishida, Samir Lounis, and Stefan Blügel
	12:45	MA 20.7	All-electron holography of hopfions enabled by magneto-induced charges — •Moritz Winterott and Samir Lounis