@article { , title = {Optical excitation of single- and multi-mode magnetization precession in Fe-Ga nanolayers}, abstract = {We demonstrate a variety of precessional responses of the magnetization to ultrafast optical excitation in nanolayers of Galfenol (Fe,Ga), which is a ferromagnetic material with large saturation magnetization and enhanced magnetostriction. The particular properties of Galfenol, including cubic magnetic anisotropy and weak damping, allow us to detect up to 6 magnon modes in a 120nm layer, and a single mode with effective damping \_eff = 0.005 and frequency up to 100 GHz in a 4- nm layer. This is the highest frequency observed to date in time-resolved experiments with metallic ferromagnets. We predict that detection of magnetisation precession approaching THz frequencies should be possible with Galfenol nanolayers.}, doi = {10.1103/PhysRevApplied.11.031003}, eissn = { 2331-7019}, issue = {3}, journal = {Physical Review Applied}, publicationstatus = {Published}, publisher = {American Physical Society}, url = {https://nottingham-repository.worktribe.com/output/1563019}, volume = {11}, year = {2019}, author = {Scherbakov, A.V. and Danilov, A.P. and Godejohann, F. and Linnik, T.L. and Glavin, B.A. and Shelukhin, L. A. and Pattnaik, D.P. and Wang, M. and Rushforth, Andrew and Yakovlev, D.R. and Akimov, A.V. and Bayer, M.} }