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NMR spectra for the Co thin film (upper panel) and for the rubrene-Co nanocomposites (lower panel) at 2 K.
The magnetic field dependence of the NMR spectrum for the rubrene-Co nanocomposite. The external magnetic field was set to be 0, 1, 2, 3, and 6 T. All spectra are shifted in proportional to the gyromagnetic ratio .
Decay of the spin echo with pulse separation at 171, 199, 224, and 242 MHz at 2 K. A fast and a slow relaxation time can be clearly seen.
The two-component values at a zero magnetic field. and are shorter and longer spin relaxation time constants, respectively.
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