Magnetization Process of Single Molecule Magnets at Low Temperatures

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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 SC lattices, m ∝ sqrt(t), as observed in Fe₈, but only for 1+2*log₁0(hd/hw) time decades, where hd is a nearest neighbor dipolar magnetic field and a spin reversal can occur only if the field on it is within (-hw,hw). However, the sqrt(t) behavior is not universal. For BCC and FCC lattices, m ∝ tᵖ, but p ≃ 0.7. The value to which m finally levels off is also given.