Magnetization Process of Single Molecule Magnets at Low Temperatures

Details Magnetization Process of Single Molecule Magnets at Low Temperatures Magnetization Process of Single Molecule Magnets at Low Temperatures

2003-09-16

arxiv.org/abs/cond-mat/0309384v1

Phys. Rev. Lett., v91, 047202 (2003)

Physics

Condensed Matter

5 LaTeX pages, 2 figures. Submitted to Phys. Rev. Lett. on 26 January 2003, accepted on 24 July 2003

Scientific paper

10.1103/PhysRevLett.91.047202

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 SC lattices, m \propto sqrt(t), as observed in Fe_8, but only for 1+2*log_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 \propto t^p, but p \simeq 0.7. The value to which m finally levels off is also given.

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