Dresden 2020 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 43: Focus Session: Higher-Order Magnetic Interactions – Implications in 2D and 3D Magnetism I

Donnerstag, 19. März 2020, 09:30–13:00, HSZ 04

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 and Stefan Blügel (Forschungszentrum Jülich), Jonathan White (Paul Scherrer Institut)

09:30 MA 43.1 Hauptvortrag: Magnetic vortices, skyrmions, and hedgehogs stabilized by long-range multiple-spin interactions — •Yukitoshi Motome
10:00 MA 43.2 Hauptvortrag: Formation of spin-hedgehog lattices and giant topological transport properties in chiral magnets — •Naoya Kanazawa
10:30 MA 43.3 Hauptvortrag: Topological-chiral magnetic interactions driven by emergent orbital magnetism — •S. Grytsiuk, J.-P. Hanke, M. Hoffmann, J. Bouaziz, O. Gomonay, G. Bihlmayer, S. Lounis, Y. Mokrousov, and S. Blügel
11:00 MA 43.4 The chiral biquadratic pair interaction — •Sascha Brinker, Manuel dos Santos Dias, and Samir Lounis
  11:15 15 min. break.
11:30 MA 43.5 Hauptvortrag: How to understand the physics of complex spin structures — •Matthias Bode
12:00 MA 43.6 Discovery of a triple-Q state in an ultrathin transition-metal filmJonas Spethmann, Sebastian Meyer, Kirsten von Bergmann, Soumyajyoti Haldar, Jonas Sassmannshausen, •Stefan Heinze, Roland Wiesendanger, and André Kubetzka
12:15 MA 43.7 Isotropic four-spin interactions in magnetic trimers — •Andras Laszloffy, Bendeguz Nyari, and Laszlo Szunyogh
12:30 MA 43.8 First-principles multispin interactions and their impact on magnetic properties — •Sergiy Mankovsky, Svitlana Polesya, Alberto Marmodoro, Eszter Simon, and Hubert Ebert
12:45 MA 43.9 Role of higher-order exchange interactions for skyrmion stability — •Souvik Paul, Soumyajyoti Haldar, Stephan von Malottki, and Stefan Heinze
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DPG-Physik > DPG-Verhandlungen > 2020 > Dresden