SEMINAR 2024

Abstract

A common theme in the study of magnetic materials is the ever-reducing spatial and magnetic footprints which promises novel properties at reduced dimensions and the miniaturization of technology. Supporting this research progress is the timely development of quantum sensing based on nitrogen-vacancies in diamond which provides micro-tesla sensitivity, nanometre resolution and minimal perturbation amongst other advantages [1-3].

Here, I will introduce my experience of magnetic imaging for non-trivial spin textures [4] and its evolution to quantum sensing. I will then cover unique adaptations of quantum sensing with dichroic X-ray [5] and magnetic force microscopy [6], and reversal field techniques [7] to explore non-trivial spin textures in both antiferromagnetic and magnetic films down to an atomic layer. I will highlight the intriguing insights enabled by quantum sensing including the vorticity readout of antiferromagnetic textures and the nucleation of domains in two-dimensional magnets. Finally, I will provide an overview of the prospective developments and adaptations of quantum sensing as a versatile platform to explore emergent phenomena in magnetic materials.

References

1. Taylor J. M., et al. Nat. Phy. 4, 10 (2008)
2. Balasubramanian, G., et al. Nat. 455, 7213 (2008)
3. CL Degen. APL 92, 24 (2008)
4. A. K.C. Tan, et al. Nat. Comm. 12, 4252 (2021)
5. A. K.C. Tan, et al. Nat. Mat. (In Press, 2023)
6. L. Stefan, A. K.C. Tan, et al. PRApplied 16, 014054 (2021)
7. M. Högen, … A. K.C. Tan, et al. ACS nano 17, 17 (2023)