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Probing two-dimensional magnetic phenomena with diamond quantum microscopy https://doi.org/10.17863/CAM.102019 Hoegen, Michael Atature, Mete The demand for data storage continues to increase, driving the exploration and character- isation of novel materials for post-silicon technology. The development of high-density memory devices based on novel magnetic materials has promising aspects such as un- matched data retention and low power consumption. However, this technology is still in its early stages and requires further development. Two-dimensional van der Waals magnets and antiferromagnets are emerging material platforms that have recently gained popularity but still lack a complete understanding of their underlying mechanisms. In particular, the low magnetic signal poses a significant limitation to real-space detection slowing down further understanding. Among the limited pool of available magnetic imaging techniques, Diamond Quantum Microscopy (DQM), based on a single-spin defect in diamond, has recently emerged as promising tool for advanced magnetic imaging. The unprecedented magnetic sensitivity in combination with the nanometre-scale resolution offers new possibilities for exploring fundamental physics as well as characterising next-generation material platforms in a lab-based setting. In this thesis, the working principles of diamond quantum microscopy are presented and discussed. This is followed by using the DQM setup to demonstrate new insights into a promising two-dimensional magnet in the atomically thin limit at cryogenic temperatures. Additionally, interesting new physical mechanisms are revealed in a prototypical canted antiferromagnet, highlighting the unique capabilities of DQM. These outcomes demonstrate the crucial role that DQM plays in the exploration of next-generation materials. University of Cambridge 2023-05-30 Thesis Doctoral Doctor of Philosophy (PhD) eng https://www.repository.cam.ac.uk/handle/1810/358308 https://apollo8-f-pro.lib.cam.ac.uk/bitstreams/76c6a5bf-bea9-4782-acf6-5d1d3aebedb5/download 4ed8a239cb5324300b9f84f497312808 https://apollo8-f-pro.lib.cam.ac.uk/bitstreams/3672c0c7-101c-4fde-bd12-3f6d064e847c/download 87eda9de84448d1f82354d60eee3eb5f https://creativecommons.org/licenses/by/4.0/ 2D materials diamond magnetometry magnetism nanoscale magnetic imaging nitrogen vacancy center