  Molecular spintroinic device based on a single-molecule magnet is one of the
ultimate goals of semiconductor nanofabrication technologies. It is thus
necessary to understand the electron transport properties of a single-molecule
magnet junction. Here we study the negative differential conductance and
super-Poissonian shot noise properties of electron transport through a
single-molecule magnet weakly coupled to two electrodes with either one or both
of them being ferromagnetic. We predict that the negative differential
conductance and super-Poissonian shot noise, which can be tuned by a gate
voltage, depend sensitively on the spin polarization of the source and drain
electrodes. In particular, the shot noise in the negative differential
conductance region can be enhanced or decreased originating from the different
formation mechanisms of negative differential conductance. The effective
competition between fast and slow transport channels is responsible for the
observed negative differential conductance and super-Poissonian shot noise. In
addition, we further discuss the skewness and kurtosis properties of transport
current in the super-Poissonian shot noise regions. Our findings suggest a
tunable negative differential conductance molecular device, and the predicted
properties of high-order current cumulants are very interesting for a better
understanding of electron transport through single-molecule magnet junctions.
