Magnetization dynamics in the single-molecule magnet Fe8 under pulsed microwave irradiation

Details Magnetization dynamics in the single-molecule magnet Fe8 under pulsed microwave irradiation Magnetization dynamics in the single-molecule magnet Fe8 under pulsed microwave irradiation

2007-01-15

arxiv.org/abs/cond-mat/0701324v1

PHYSICAL REVIEW B 75, 064408 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

14 pages, 12 figures

Scientific paper

10.1103/PhysRevB.75.064408

We present measurements on the single molecule magnet Fe8 in the presence of pulsed microwave radiation at 118 GHz. The spin dynamics is studied via time resolved magnetization experiments using a Hall probe magnetometer. We investigate the relaxation behavior of magnetization after the microwave pulse. The analysis of the experimental data is performed in terms of different contributions to the magnetization after-pulse relaxation. We find that the phonon bottleneck with a characteristic relaxation time of 10 to 100 ms strongly affects the magnetization dynamics. In addition, the spatial effect of spin diffusion is evidenced by using samples of different sizes and different ways of the sample's irradiation with microwaves.

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