Superconducting meander-line surface coil for NMR spectroscopy of nanoscale thin films

Nuclear magnetic resonance is a valuable technique for studying a wide variety of quantum materials, but the small magnetic moments involved make it particularly challenging to apply to thin films or two-dimensional materials. This work implements a superconducting meander-line surface coil that achieves a high filling factor, even for very thin samples, and enables one to obtain an NMR signal and perform spin-echo measurements on a sample of boron just 150 nm thick. The article also provides a roadmap for improving this approach to achieve measurements in the single-layer limit, which is quite promising for the study of magnetism and correlated electrons in two-dimensional systems.