Expérimental
Quantum sensors take advantage of the extreme sensitivity of quantum systems to external perturbations to accurately measure a broad range of physical quantities such as acceleration, rotation, magnetic and electric fields, or temperature. Among a wide variety of quantum systems employed for sensing purposes, the nitrogen-vacancy (NV) defect in diamond has garnered considerable attention in the last decade for the development of a new generation of magnetometers providing an unprecedented combination of spatial resolution and magnetic sensitivity under ambient conditions. The goal of the present project is to combine the capability of scanning NV microscopy to image nanoscale magnetic textures with its sensitivity to the fluctuating magnetic stray field which is produced by thermally activated spin waves. This combination will offer us the possibility to probe magnetic excitations which are confined inside domain walls. This experiment will allow us to check predictions about the dispersion of spin waves confined inside antiferromagnetic domain walls and to explore the effect of the texture of the domain wall itself on these spin waves.