Dynamics of SP NPs by NMR

1H-NMR study of the spin dynamics of fine superparamagnetic nanoparticles.
L. Bordonali,Y. Furukawa, M. Kraken, F. J. Litterst, C. Sangregorio, M. F. Casula, and A. Lascialfari
Phys. Rev. B 85, 174426 (2012)

Average proton spin-lattice relaxation rate  plotted vs temperature for two external magnetic fields. Inset: semilog plot of the distributions of energy barriers related to the two investigated static fields, as extracted from Eq. (2).