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
    Issue number3
    StatePublished - Aug 1 2008

    ASJC Scopus subject areas

    • Physics and Astronomy(all)


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