title: Magnetization process of single molecule magnets at low temperatures.
abstract: 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 m proportional, variant sqrt[t], as observed in Fe8, 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 sqrt[t] behavior is not universal. For bcc and fcc lattices, m proportional, variant t(p), but p approximately 0.7. The value to which m finally levels off is also given.
authors.affiliation: ICMA, CSIC and Universidad de Zaragoza, 50009-Zaragoza, Spain. JFF@Pipe.Unizar.Es
authors.forename: Julio F
authors.initials: JF
authors.lastname: Fernández
authors.forename: Juan J
authors.initials: JJ
authors.lastname: Alonso