Magnetization process of single molecule magnets at low temperatures -: art. no. 047202

We show that correlations established before quenching to very low temperatures later drive the magnetization process of systems of single molecule magnets, after a magnetic field is applied at t=0. We also show that in simple cubic lattices mproportional to roott, as observed in Fe-8, but only for 1+2log(10)(h(d)/h(w)) time decades, where h(d) is a nearest neighbor dipolar magnetic field and a spin reversal can occur only if the field on it is within (-h(w),h(w)). However, the roott behavior is not universal. For bcc and fcc lattices, mproportional tot(p), but psimilar or equal to0.7. The value to which m finally levels off is also given.