Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2008-04-22
Europhys. Lett., 83, 37006 (2008)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
6 pages, 4 figures, submitted to Europhys. Lett
Scientific paper
10.1209/0295-5075/83/37006
Spin relaxation between the two lowest-lying spin-states has been studied in the S=4 single molecule magnet Ni$_4$ under steady state conditions of low amplitude and continuous microwave irradiation. The relaxation rate was determined as a function of temperature at two frequencies, 10 and 27.8 GHz, by simultaneously measuring the magnetization and the absorbed microwave power. A strong temperature dependence is observed below 1.5 K, which is not consistent with a direct single-spin-phonon relaxation process. The data instead suggest that the spin relaxation is dominated by a phonon bottleneck at low temperatures and occurs by an Orbach mechanism involving excited spin-levels at higher temperatures. Experimental results are compared with detailed calculations of the relaxation rate using the universal density matrix equation.
Beedle Christopher C.
Garanin Dmitry A.
Hendrickson David N.
Kent Andrew D.
Loubens Grégoire de
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