• DOI:10.1103/PHYSREVB.76.104416
• Corpus ID: 54666432

Spin dynamics in ferromagnets : Gilbert damping and two-magnon scattering

@article{Zakeri2007SpinDI,
  title={Spin dynamics in ferromagnets : Gilbert damping and two-magnon scattering},
  author={Kh. Zakeri and J{\"u}rgen Lindner and Igor Barsukov and Ralf Meckenstock and Michael Farle and U. von H{\"o}rsten and Heiko Wende and Werner Keune and Jan Rocker and Sangita S. Kalarickal and Kilian Lenz and Wolfgang Kuch and Klaus Baberschke and Zdeněk Frait},
  journal={Physical Review B},
  year={2007},
  volume={76},
  pages={104416}
}

• K. Zakeri, J. Lindner, +11 authors Z. Frait
• Published 14 September 2007
• Materials Science, Physics
• Physical Review B

The magnetic relaxation processes following the dynamical excitation of the spin system of ferromagnets are investigated by ferromagnetic resonance (FMR) between 1 and $70\phantom{\rule{0.3em}{0ex}}\mathrm{GHz}$ using epitaxial ${\mathrm{Fe}}_{3}\mathrm{Si}$ films as a prototype system. Two relaxation channels, i.e., dissipative, isotropic Gilbert damping $G$ as well as anisotropic two-magnon scattering $\ensuremath{\Gamma}$, are simultaneously identified by frequency and angle dependent FMR and quantitatively analyzed. The scattering rates due to two-magnon scattering at crystallographic defects for spin waves propagating in ⟨100⟩ and ⟨110⟩ directions, $\ensuremath{\gamma}{\ensuremath{\Gamma}}_{⟨100⟩}=0.25(2)\phantom{\rule{0.3em}{0ex}}\mathrm{GHz}$ and $\ensuremath{\gamma}{\ensuremath{\Gamma}}_{⟨110⟩}=0.04(2)\phantom{\rule{0.3em}{0ex}}\mathrm{GHz}$, and the Gilbert damping term $G=0.051(1)\phantom{\rule{0.3em}{0ex}}\mathrm{GHz}$ are determined. We show that changing the film thickness from $8\phantom{\rule{0.3em}{0ex}}\text{to}\phantom{\rule{0.3em}{0ex}}40\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ and slightly modifying the Fe concentration influence the relaxation channels. Our results, which reveal the contributions of longitudinal and transverse relaxation processes may be of general importance for the understanding of spin-wave dynamics in magnetic structures.