Cg. Kim et al., NUCLEAR MAGNETIC RESONANCE-BASED CURRENT-VOLTAGE SOURCE, IEEE transactions on instrumentation and measurement, 42(2), 1993, pp. 153-156
A one-ampere current has been stabilized using nuclear magnetic resona
nce techniques. A pair of tandem solenoids produces two uniform magnet
ic fields in opposite directions, and these fields are not affected by
external magnetic shielding. The current and background field are con
trolled to within 0.1 ppm over an 8 h period.