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We report an electronic magnetization measurement of a quantum point contact(QPC) based on nuclear magnetic resonance (NMR) spectroscopy. We find that NMRsignals can be detected by measuring the QPC conductance under in-planemagnetic fields. This makes it possible to measure, from Knight shifts of theNMR spectra, the electronic magnetization of a QPC containing only a fewelectron spins. The magnetization changes smoothly with the QPC potentialbarrier height and peaks at the conductance plateau of 0.5 $\times$ $2e^2/h$.The observed features are well captured by a model calculation assuming asmooth potential barrier, supporting a no bound state origin of the 0.7structure.

Electronic magnetization of a quantum point contact measured by nuclear magnetic resonance