Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
1999-05-19
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
9 pages, 11 figures; accepted for publication on Eur. Phys. J. B
Scientific paper
10.1007/s100510050974
We study the magnetic relaxation of a system of localized spins interacting through weak dipole interactions, at a temperature large with respect to the ordering temperature but low with respect to the crystal field level splitting. The relaxation results from quantum spin tunneling but is only allowed on sites where the dipole field is very small. At low times, the magnetization decrease is proportional to $\sqrt{t}$ as predicted by Prokofiev and Stamp, and at long times the relaxation can be described as an extension of a relaxed zone. The results can be directly compared with very recent experimental data on Fe_8 molecular clusters.
Adam Erwan
Cuccoli Alessandro
Fort A.
Rettori Angelo
Villain Jacques
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