Volume 83, Number 3, August 2008
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||18 July 2008|
Magnetization relaxation in the single-molecule magnet Ni4 under continuous microwave irradiation
Department of Physics, New York University - 4 Washington Place, New York, NY 10003, USA
2 Department of Physics and Astronomy, City University of New York - 250 Bedford Park Boulevard West Bronx, NY 10468-1589, USA
3 Department of Chemistry and Biochemistry, University of California San Diego - La Jolla, CA 92093, USA
Corresponding author: firstname.lastname@example.org
Accepted: 16 June 2008
Spin relaxation between the two lowest-lying spin-states has been studied in the 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.
PACS: 75.45.+j – Macroscopic quantum phenomena in magnetic systems / 75.50.Xx – Molecular magnets / 76.30.-v – Electron paramagnetic resonance and relaxation
© EPLA, 2008
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