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The spin-lattice relaxation rate $T_{1}^{-1}$ and NMR spectra of $^1$H insingle crystal molecular magnets of Fe8 have been measured down to 15 mK. Therelaxation rate $T_1^{-1}$ shows a strong temperature dependence down to 400mK. The relaxation is well explained in terms of the thermal transition of theiron state between the discreet energy levels of the total spin S=10. Therelaxation time $T_1$ becomes temperature independent below 300 mK and islonger than 100 s. In this temperature region stepwise recovery of the$^1$H-NMR signal after saturation was observed depending on the return field ofthe sweep field. This phenomenon is attributed to resonant quantum tunneling atthe fields where levels cross and is discussed in terms of the Landau-Zenertransition.

Proton spin relaxation induced by quantum tunneling in Fe8 molecular nanomagnet