https://phys.org/news/2018-11-tune-heart-copper-atom.html

This is the first time NMR has been achieved using a Scanning Tunneling Microscope (STM), the Nobel Prize-winning IBM invention that allows atoms to be viewed and moved individually, an important breakthrough because the STM can image and position each atom to study how the NMR changes and responds to the local environment. By scanning the ultra-sharp tip of the STM's metal needle across the surface, the STM can sense the shape of single atoms and can pull or carry atoms into desired arrangements.

Performing NMR on a single atom requires two major steps. First, we polarized (oriented in a well-defined direction) the magnetic direction of the nucleus. Then, we manipulated the magnetism of the nucleus by applying radio waves emanating from the tip of a sharp metal needle. The radio waves are tuned precisely to the natural frequency of the nucleus.