Detection of NMR Using a Josephson-Junction Magnetometer

Abstract

Nuclear magnetic resonance has been detected by following changes in the steady-state value of the longitudinal magnetization with a Josephson-junction magnetometer. Unlike previous fast-passage detection methods, this mode of detection gives a signal amplitude of $2M_0$ independent of the resonance linewidth and the rf power level. Maximum-intensity signals from room-temperature LiF have been obtained at 40 dB less power than that required for maximum signal using conventional adiabatic fast-passage detection methods.