Radiation- and Phonon-Bottleneck-Induced Tunneling in the Fe8 Single-Molecule Magnet

Details Radiation- and Phonon-Bottleneck-Induced Tunneling in the Fe8 Single-Molecule Magnet Radiation- and Phonon-Bottleneck-Induced Tunneling in the Fe8 Single-Molecule Magnet

2007-06-23

arxiv.org/abs/0706.3471v2

Europhys. Lett., 82, 17005 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 RevTeX pages, including 4 EPS figures, version accepted for publication

Scientific paper

10.1209/0295-5075/82/17005

We measure magnetization changes in a single crystal of the single-molecule magnet Fe8 when exposed to intense, short (<20 $\mu$s) pulses of microwave radiation resonant with the m = 10 to 9 transition. We find that radiation induces a phonon bottleneck in the system with a time scale of ~5 $\mu$s. The phonon bottleneck, in turn, drives the spin dynamics, allowing observation of thermally assisted resonant tunneling between spin states at the 100-ns time scale. Detailed numerical simulations quantitatively reproduce the data and yield a spin-phonon relaxation time of T1 ~ 40 ns.

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