Imaging spin dynamics in ferromagnets using a single spin scanning magnetometer

Probing spin dynamics in ferromagnets at nanometer scale has drawn increasing attention due to the potential usage of spin waves as information carriers in future spintronic devices. Moreover, coupled with solid-state spin qubits, the spin waves may serve as information transducer between distant qubits. Here, we study spin dynamics in ferromagnets using a nitrogen-vacancy (NV) spin qubit in diamond. With the help of a single spin scanning magnetometer that hosts a NV center at the probe tip, we are able to image DC and AC magnetic field generated from the magnetic samples. For instance, we study dynamic magnetic properties of a thin Py square by mapping out Rabi oscillation frequency. From the comparison with static magnetic image, we find very distinct spin dynamics particularly around the vortex. We will further discuss on-going efforts of imaging spin waves in various ferromagnetic materials.