Imaging of Nonlinear Spin Waves in Yttrium Iron Garnet Using Nitrogen Vacancy Spin Qubits

Spin waves are coherent magnetic excitations that may exist in ferromagnets. The state of the art host material for these spin waves is yttrium iron garnet (YIG) due to its low dissipation [1]. Recent experiments have demonstrated the coupling between spin waves in YIG and nitrogen vacancy (NV) spin quibits in diamond, which are well established quantum sensors of magnetic fields [2]. Due to the potential of YIG spin waves to be used in magnetic scattering and spintronic applications, it is of interest to further understand magnon-magnon interactions at high excitation powers [3]. In this experiment, we use NV magnetic sensing to image four-magnon interaction processes in YIG under various excitation parameters. Understanding these processes will potentially allow for the off resonant generation and detection of short wavelength magnons.

 

[1] A. A. Serga et al. YIG Magnonics. J. Phys. D: Appl. Phys.,43 (26):264002 (2010). doi: 10.1088/0022-3727/43/26/264002.

[2] T. X. Zhou et al., A Magnon Scattering Platform, PNAS, 118 (25):2019473118 (2021). doi: 10.1073/pnas.2019473118.

[3] Carmiggelt, J.J., Bertelli, I., Mulder, R.W. et al. Broadband microwave detection using electron spins in a hybrid diamond-magnet sensor chip. Nat Commun 14, 490 (2023). doi: 10.1038/s41467-023-36146-3