SKM 2021 – wissenschaftliches Programm

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SYNV: Symposium Potentials for NVs sensing magnetic phases, textures and excitations

SYNV 1: Potentials for NVs sensing magnetic phases, textures and excitations

SYNV 1.1: Hauptvortrag

Montag, 27. September 2021, 13:30–14:00, Audimax 2

Spin-based microscopy of 2D magnetic systems — •Jörg Wrachtrup — 3rd Physics Institute, University of Stuttgart, Stuttgart, Germany

The investigation of magnetic order in 2D materials requires dedicated probes. While conventional probes of magnetism with nanoscale resolution, like Lorenz microscopy or MFM fail for few layer- or monolayer samples, STM requires dedicated sample preparation. NV-based magnetic probes on the other hand are very well suited to provide quantitative data with a few ten nm spatial resolution and sufficient sensitivity, even for monolayer samples. In the talk I will describe experiments on CrBr3 which show the domain structure of the material [1]. Upon imaging material with different number of layers we gained insight into interlayer coupling and it impact on magnetic order. We also measure magnetic order over a wide range of temperatures and derive information on the physics of the phase transition of CrBr3. In addition, I will show measurements on CrI3 samples of different thickness and relative orientation where we find signatures of Moiré patterns in twisted multilayers [2].

[1] Qi-Chao Sun et al. Magnetic domains and domain wall pinning in atomically this CrBr3 revealed by nanoscale imaging, Nature Comm. 12, 1989 (2021) [2] Qi-Chao Sun et al. Direct visualization of magnetic domains and moiré magnetism in twisted two-dimensional magnets, submitted (2021)