Low field NMR spans a range of different nuclear magnetic resonance (NMR) modalities, going from NMR conducted in permanent magnets, supporting magnetic fields of a few tesla (T), all the way down to zero field NMR, where the Earth's field is carefully shielded such that magnetic fields of nanotesla (nT) are achieved where nuclear spin precession is close to zero.
In a broad sense, Low-field NMR is the branch of NMR that is not conducted in superconducting high-field magnets.
"Normal" high field NMR relies on the detection of spin-precession with inductive detection with a simple coil.
However, this detection modality becomes less sensitive as the magnetic field and the associated frequencies decrease.
Hence the push toward alternative detection methods at very low fields.