Nuclear Magnetic Resonance With No Magnets : polarization even at zero field with parahydrogen, optical-atomic magnetometry, and J-coupling NMR - Berkeley Lab
https://newscenter.lbl.gov/2011/05/17/nmr-no-magnets/A simple and low-cost permanent magnet system for NMR : 57 mT, 4e-4 homogeneity, 90Hz resolution for 1H - Chonlathep 2017