Habil presentation talk | December 09, 16:30
Magnetic Order in 2D Materials Beyond Bulk Constraints
The discovery of intrinsic magnetism in exfoliated 2D materials marked a major milestone, showing that magnetic order can survive even in the 2D limit. Exfoliation, developed during the graphene era, enabled access to several new 2D magnetic materials. However, this approach inherently restricts research to phases that already exist in bulk, limiting access to many potentially interesting materials, an obstacle that molecular beam epitaxy (MBE) can overcome. MBE enables controlled synthesis of single-layer materials directly related to, yet often distinct from, their bulk counterparts.
To probe these novel 2D magnets at the atomic scale, spin-polarized scanning tunneling microscopy provides an ideal tool for investigating magnetic order with high spatial resolution. In my talk, I will give an overview of 2D magnetic materials and discuss the emerging magnetic properties of novel single layers Cr2S3-2D and Fe2S2-2D. Cr2S3 forms a covalently bonded structure without van der Waals gaps and hosts ferromagnetic coupling within the plane, with antiferromagnetic coupling between Cr planes. Fe2S2 exhibits a unique hexagonal phase showing noncollinear in-plane magnetic moments.
PH2, UzK
H3
Contact: Thomas Michely