A single electron spin to study magnons in a magnetic insulator

A single electron spin as a quantum sensor is an ideal tool to study novel condensed matter physics. Recently, NV center in diamond has been used as a single electron spin sensor to explore topics of skyrmion^[1] and spin chemical potential in ferromagnetic insulator^[2]. In this work, we use a single NV center in scanning probe microscope^[3] to study magnons in yttrium iron garnet (YIG).
References:
[1] Y. Dovzhenko, F. Casola, S. Schlotter, T. X. Zhou, F. Büttner, R. L. Walsworth, G. S. D. Beach, A. Yacoby, Nature Communications 2018, 9, 2712.
[2] C. Du, T. van der Sar, T. X. Zhou, P. Upadhyaya, F. Casola, H. Zhang, M. C. Onbasli, C. A. Ross, R. L. Walsworth, Y. Tserkovnyak, A. Yacoby, Science 2017, 357, 195.
[3] T. X. Zhou, R. J. Stöhr, A. Yacoby, Appl. Phys. Lett. 2017, 111, 163106.