Quantitative imaging of nonlinear spin-wave dynamics using diamond quantum sensors

Spin-wave dynamics in magnetic materials reflect the diverse interactions among spins and anisotropy within the magnet, resulting in a variety of dispersion relationships and nonlinear phenomena [1]. Recently, nitrogen-vacancy (NV) centers in diamond have gained attention as a sensor for detecting spin waves. NV centers can quantitatively image the spatial distribution of the spin-wave amplitude and phase by sensing the microwaves generated by the spin waves [2, 3].

In this presentation, we demonstrate the results of quantitatively imaging surface spin waves propagating in a YIG film using a wide-field NV microscope. In particular, we show the results of sweeping the excitation microwave amplitude and nonlinear dynamics observed for the large excitation power.

[1] P. Pirro et al., Nat. Rev. Mater. 6, 1114 (2021).

[2] I. Bertelli et al., Sci. Adv. 6, eabd3556 (2020).

[3] T. X. Zhou et al., Proc. Natl. Acad. Sci. U.S.A. 118, e2019473118 (2021).