Magnetization relaxation in the single-molecule magnet Ni4 under continuous microwave irradiation

G. De Loubens, D. A. Garanin, C. C. Beedle, D. N. Hendrickson, A. D. Kent

    Research output: Contribution to journalArticlepeer-review


    Spin relaxation between the two lowest-lying spin-states has been studied in the S=4 single-molecule magnet Ni4 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.

    Original languageEnglish (US)
    Article number37006
    JournalEurophysics Letters
    Issue number3
    StatePublished - Aug 1 2008

    ASJC Scopus subject areas

    • General Physics and Astronomy


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