We have monitored the Landau–Zener dynamics of a single–ion magnet inserted into a spin–transistor geometry. For increasing field–sweep rates, the spin reversal probability shows increasing deviations from that of a closed system. In the low–conductance limit, such deviations were shown to result from a dephasing process. In particular, the observed behaviors were successfully simulated by means of an adiabatic master equation, with time averaged dephasing (Lindblad) operators. The time average was tentatively interpreted in terms of the finite time resolution of the continuous measurement.
Contact person: Filippo Troiani, NANO Modena