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Magnetization Process of Single Molecule Magnets at Low Temperatures

J. F. Fernandez·J. J. Alonso
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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 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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J. F. Fernandez, J. J. Alonso. 2003-09-16. Magnetization Process of Single Molecule Magnets at Low Temperatures. https://doi.org/10.1103/physrevlett.91.047202

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