Nuclear magnetic resonance (NMR) spectroscopy is a powerful technique for the study of local magnetism in a variety of materials. However, the inherently low sensitivity of conventional inductively detected solid-state NMR typically requires a large number of spins, reducing its applicability to two-dimensional materials and nanoscale thin films. To overcome this experimental challenge, we introduce a probe based on a superconducting meander-line surface coil that significantly enhances the NMR sensitivity for thin samples. Using an $\mathrm{Nb}\mathrm{N}$ meander with an optimized geometry, we demonstrate the sensitivity of this technique by detecting the NMR signal of a 150-nm-thick boron film containing only approximately $2\times {10}^{16}{}^{11}$$\mathrm{B}$ nuclear spins. Spin-echo measurements and theoretical modeling offer insight into the parameters limiting the performance of the coil. This work hopefully lays the foundation for developing highly sensitive NMR probes, potentially unlocking new opportunities for studying atomically thin materials.

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• Superconducting RF
• 2-dimensional systems
• Heterostructures
• Low-temperature superconductors
• Solid-state detectors
• Ultrathin films
• Nuclear magnetic resonance
• Radio frequency techniques