Probing two-dimensional magnetic phenomena with diamond quantum microscopy

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.

Name dc:type.qualificationname

Doctor of Philosophy (PhD)

Level dc:type.qualificationlevel

Doctoral

Grantor dc:publisher.institution

University of Cambridge

Year dc:date.issued

2023

Author dc:creator

• Hoegen, Michael

Advisor dc:contributor.advisor

• Atature, Mete

• 2D materials
• diamond magnetometry
• magnetism
• nanoscale magnetic imaging
• nitrogen vacancy center

Licence

• https://apollo8-f-pro.lib.cam.ac.uk/bitstreams/3672c0c7-101c-4fde-bd12-3f6d064e847c/download
• https://creativecommons.org/licenses/by/4.0/

Language dc:language

eng

DOI dc:identifier.doi

https://doi.org/10.17863/CAM.102019

OAI identifier oai:identifier

oai:www.repository.cam.ac.uk:1810/358308