Tutorial QM01: Novel Approaches to Manipulate and Detect 2D Magnetism in van der Waals Quantum and Topological Materials

Instructors: Hidekazu Kurebayashi, London Centre for Nanotechnology, University College London; Nirmal J. Ghimire, George Mason University; Charudatta Phatak, Argonne National Laboratory; Wenli Bi, University of Alabama at Birmingham; Yongtao Cui, University of California Riverside; Luis Balicas, National High Magnetic Field Lab, Florida State University

Recently, a number of layered and exfoliable two-dimensional compounds have been shown to display ferromagnetism at room temperature and beyond. Examples, include ionic liquid gated Fe3GeTe2, Fe5GeTe2 and its Ni and Co doped variants, as well as the just reported Fe3GaTe2. Here, we will discuss their synthesis, overall properties, and the emergence of topological spin textures such as merons and skyrmions at room temperature, that reveals their potential for skyrmionics. Here, we will discuss a few experimental techniques exposing their presence in 2D vdW magnets via topological Hall effect, electrical and thermo-electrical transport, Lorentz transmission electron microscopy, soft x-ray photoelectron electron microscopy, and magnetic force microscopy. A introduction on these subjects will be provided based on the state-of-the-art results obtained in the field.

In this tutorial, the participants will learn:

• The advanced synthesis, overall properties, and the emergence of topological spin textures such as meron and skyrmions of exfoliable 2D magnets.
• The unique power of Lorentz transmission electron microscopy, soft x-ray photoelectron electron microscopy, and magnetic force microscopy to study 2D magnetic properties.
• The pressure control of magnetic properties of van der Waals magnets and the application of synchrotron x-ray methods.
• The utility of scanning probes to study the electronic and magnetic properties of 2D quantum materials.
• Intercalation-induced properties in layered quantum materials.
• Spin dynamics and spin transport properties of 2D magnetic heterostructures.

Tutorial Schedule