Figure 4: Magnetic characterization of Mn₁₂Ac@GMWNT.

In-phase (a) and out-of-phase (b) components of the AC susceptibility of Mn₁₂Ac@GMWNT (1) measured with an AC field of 3.5 Oe at different frequencies, showing slow relaxation of the magnetization of the encapsulated Mn₁₂Ac molecules. (c) Hysteresis curves of magnetization recorded for Mn₁₂Ac@GMWNT (red) at 1.8 K and for the control sample Mn₁₂Ac (2) (black). (d) Derivatives of the hysteresis curves shown in (c), including the energy level scheme for Mn₁₂Ac plotted as a function of field (thin crossing lines), calculated using parameters reported previously¹¹.