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Probing two-dimensional magnetic phenomena with diamond quantum microscopy


Type

Thesis

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Authors

Hoegen, Michael 

Abstract

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.

Description

Date

2023-05-30

Advisors

Atature, Mete

Keywords

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

Qualification

Doctor of Philosophy (PhD)

Awarding Institution

University of Cambridge
Sponsorship
EPSRC (2493520)

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