Magnetization process of single molecule magnets at low temperatures.
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.
Fernández
Julio F
JF
ICMA, CSIC and Universidad de Zaragoza, 50009-Zaragoza, Spain. JFF@Pipe.Unizar.Es
Alonso
Juan J
JJ