SKM 2021 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 10: Focus Session: Higher-Order Magnetic Interactions - Implications in 2D and 3D Magnetism I

Mittwoch, 29. September 2021, 13:30–16:30, H5

Materials in which the magnetic moments order or cooperate in unusual ways underpin a plethora of physical phenomena, from strong magnetoelectric effects to topological quasiparticles, thus holding great promise for future spintronic and quantum computing applications. Magnetic interactions are the fundamental quantities that explain the complex magnetic phase diagrams and exotic excitation spectra of these intriguing materials. Recent theoretical and experimental developments have led to a realization of a pivotal role played by higher-order magnetic interactions in stabilizing intricate magnetic structures. The 4-spin 3-site interaction stabilizes an up-up-down-down state, which can become chiral. Theoretically, novel 4-spin chiral interactions and even 6-spin (chiral-chiral) couplings might explain the emergence of complex short-period 3D magnetic structures, and could open a path to the discovery of materials hosting 3D topological magnetization textures, such as magnetic hopfions. Experimentally, 4-spin interactions are conjectured to play a central role in skyrmions lattice formation in frustrated centrosymmetric materials. This area of research will make a strong impact in the field of magnetism in the upcoming years.

Organizers: Samir Lounis (University of Duisburg-Essen and Forschungszentrum Jülich), Manuel dos Santos Dias and Stefan Blügel (Forschungszentrum Jülich), Jonathan White (Paul Scherrer Institut)

	13:30	MA 10.1	Hauptvortrag: Topological spin crystals stabilized by itinerant frustration — •Yukitoshi Motome
	14:00	MA 10.2	Hauptvortrag: Formation of spin-hedgehog lattices and giant topological transport properties in chiral magnets — •Naoya Kanazawa
	14:30	MA 10.3	Hauptvortrag: Topological-chiral magnetic interactions driven by emergent orbital magnetism — •Sergii Grytsiuk, Jan-Philipp Hanke, Markus Hoffmann, Juba Bouaziz, Olena Gomonay, Gustav Bihlmayer, Samir Lounis, Yuriy Mokrousov, and Stefan Blügel
	15:00		15 min. break.
	15:15	MA 10.4	Hauptvortrag: Complex spin structures in thin transition metals films and their oxides — •Matthias Bode
	15:45	MA 10.5	Two-dimensional atomic-scale spin textures in Fe monolayers — André Kubetzka, Roland Wiesendanger, and •Kirsten von Bergmann
	16:00	MA 10.6	Three- and four-spin interactions from first-principles: calculations and properties — •Sergiy Mankovsky, Svitlana Polesya, and Hubert Ebert
	16:15	MA 10.7	Role of higher-order exchange interactions for skyrmion stability — •Souvik Paul, Soumyajyoti Haldar, Stephan von Malottki, and Stefan Heinze