Regensburg 2025 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 64: Focus Session Atomic Scale Investigation of Magnetic 2D Materials

Mittwoch, 19. März 2025, 15:00–18:00, H2

The rapid expansion of the family of magnetic two-dimensional (2D) materials led to the observation of various types of magnetic order in the 2D limit, such as (anti-)ferromagnetism, noncolinear structures, and magnetic moiré effects. On the fundamental level, there are various open questions regarding the mechanisms that underlie these ground states, as well as the understanding of the role of the interface and dimensionality.

Epitaxial growth of 2D magnetic materials on inert substrates under ultrahigh vacuum conditions and respective in situ investigation allows direct and unambiguous comparison between experimental findings and theoretical calculations. Experimentally, (spin-polarized) scanning tunneling microscopy methods are ideal to explore the electronic structure and magnetic properties of emerging 2D magnetic phases with ultimate real-space and energy resolution at low temperatures. These results are often corroborated by averaging techniques such as X-ray magnetic circular dichroism or magneto-optic Kerr effect. Theoretically, the use of model Hamiltonians requires atomically well-defined systems to precisely predict the electronic and magnetic properties. Combining these complementary approaches helps to elucidate the role of the substrate, defects, and the coupling between quasiparticles in stacked heterostructures.

This focus session aims at highlighting recent progress in the growth and characterization of magnetic states in epitaxial 2D materials and 2D heterostructures on metal substrates, bringing together experts from the fields of scanning probe techniques and first-principles calculations. The overall goal of the session is to gain fundamental insights into the driving mechanisms of 2D magnetic phases.

Organized by
Jeison Fischer, University of Cologne, Germany,
Wouter Jolie, University of Cologne, Germany.

	15:00	O 64.1	Hauptvortrag: Topological spin structures in two-dimensional van der Waals magnets and heterostructures — •Stefan Heinze
	15:30	O 64.2	Hauptvortrag: Ferromagnetic Order in 2D Layers of Transition Metal Dichlorides — Andrea Aguirre, Andres Pinar, Diego Soler, Carmen Gonzalez-Orellana, Jon Ortuzar, Oleksandr Stesovych, Celia Rogero, Jose Ignacio Pascual, Pavel Jelinek, Maxim Ilyn, and •Martina Corso
	16:00	O 64.3	Hauptvortrag: Tailoring spin lattice in van der Waals monolayer crystals — •Ying-Shuang Fu
	16:30	O 64.4	Hauptvortrag: Spin excitations in 2D heterostructures from realistic fermionic models — •António Costa
	17:00	O 64.5	Monolayer Multiferroic - Superconductor van der Waals Heterostructures — •Büşra Gamze Arslan, Mohammad Amini, Ziying Wang, Robert Drost, and Peter Liljeroth
	17:15	O 64.6	Engineering the electronic and magnetic properties of MPS3 (M=Fe, Ni, Co, Mn) materials through alkali metal doping — Jonah Nitschke, •Preeti Bhumla, Till Willershausen, Patrick Merisescu, Lasse Sternemann, Valentin Mischke, Michele Capra, Mira Arndt, David Janas, Giovanni Zamborlini, Silvana Botti, and Mirko Cinchetti
	17:30	O 64.7	Conflicting magnetic anisotropy in 2D metal-organic networks — •Diego Radillo, Céline Hensky, Quy Hien Le, Manfred Parschau, Egzona Isufi Neziri, Christian Wäckerlin, and Pierluigi Gargiani
	17:45	O 64.8	Non-van der Waals 2D Materials: Magnetic State Control — •Tom Barnowsky and Rico Friedrich