Table 2: Critical frequency and relaxation time τ, values at three different MR concentrations.

Samples (0 volt) (4 volt) (8 volt) τ (0 volt) τ (4 volt) τ (8 volt) E7/C60/MR0.1% 3.25586 × 106 3.22366 × 106 737632.40 4.888 × 10−8 4.937 × 10−8 2.157 × 10−7 E7/C60/MR0.5% 3.52359 × 106 3.44416 × 106 795446.99 4.516 × 10−8 4.621 × 10−8 2.000 × 10−7 E7/C60/MR1.0% 3.12973 × 106 3.04494 × 106 795446.99 5.085 × 10−8 5.226 × 10−8 2.000 × 10−7