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119Sn nuclear magnetic resonance (NMR) spectra and spin-lattice relaxationrate (1/T1) in SnO2 nanoparticles were measured as a function of temperatureand compared with those of SnO2 bulk sample. A 15% loss of 119Sn NMR signalintensity for the nano sample compared to the bulk sample was observed. This isindicative of ferromagnetism from a small fraction of the sample. Another majorfinding is that the recovery of the 119Sn longitudinal nuclear magnetization inthe nano sample follows a stretched exponential behavior, as opposed to that inbulk which is exponential. Further, the 119Sn 1/T1 at room temperature is foundto be much higher for the nano sample than for its bulk counterpart. Theseresults indicate the presence of magnetic fluctuations in SnO2 nanoparticles incontrast to the bulk (non-nano) which is diamagnetic. These local moments couldarise from surface defects in the nanoparticles.

119Sn NMR probe of magnetic fluctuations in SnO2 nanoparticles