SKM 2021 – scientific programme

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MA: Fachverband Magnetismus

MA 14: Focus Session: Higher-Order Magnetic Interactions - Implications in 2D and 3D Magnetism II

Thursday, September 30, 2021, 13:30–15:15, 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 14.1	Invited Talk: The role of itinerant electrons and higher order magnetic interactions among fluctuating local moments in metallic magnets — •Julie Staunton
	14:00	MA 14.2	Short period magnetization texture of B20-MnGe explained by thermally fluctuating local moments — •Eduardo Mendive Tapia, Manuel dos Santos Dias, Sergii Grytsiuk, Julie Staunton, Stefan Blügel, and Samir Lounis
	14:15	MA 14.3	Symmetry analysis of multi-spin interactions — •Levente Rózsa
	14:30	MA 14.4	Spontaneous atomic-scale hexagonal spin lattices driven by higher-order exchange interactions — •Mara Gutzeit, André Kubetzka, Soumyajyoti Haldar, Henning Pralow, Roland Wiesendanger, Stefan Heinze, and Kirsten von Bergmann
	14:45	MA 14.5	Dzyaloshinskii-Moriya Interaction revisited — •Hiroshi Katsumoto and Stefan Blügel
	15:00	MA 14.6	Chiral multi-site interactions in prototypical magnetic systems — •Sascha Brinker, Manuel dos Santos Dias, and Samir Lounis