Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2006-06-09
Phys. Rev. Lett. 98, 087201 (2007)
Physics
Condensed Matter
Other Condensed Matter
5 pages, 4 figures, accepted by Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.98.087201
Time-resolved scanning Kerr effect microscopy has been used to study magnetization dynamics in Permalloy thin films excited by transient magnetic pulses generated by a micrometer-scale transmission line structure. The results are consistent with magnetostatic spin wave theory and are supported by micromagnetic simulations. Magnetostatic volume and surface spin waves are measured for the same specimen using different bias field orientations and can be accurately calculated by k-space integrations over all excited plane wave components. A single damping constant of Gilbert form is sufficient to describe both scenarios. The nonuniform pulsed field plays a key role in the spin wave dynamics, with its Fourier transform serving as a weighting function for the participating modes. The intrinsic Gilbert damping parameter $\alpha$ is most conveniently measured when the spin waves are effectively stationary.
Freeman Mark R.
Giesen Fabian
Liu Zhigang
Sydora Richard D.
Zhu Xiaobin
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