NMR phenomena are also utilized in low-field NMR , NMR spectroscopy and MRI in the Earth 's magnetic field ( referred to as Earth 's field NMR ) , and in several types of magnetometers .
NMR is used in low-field NMR , NMR spectroscopy and MRI in the Earth 's magnetic field ( referred to as Earth 's field NMR ) , and in several types of magnetometers .