Optical excitation of single- and multi-mode magnetization precession in Fe-Ga nanolayers

Scherbakov, A.V.; Danilov, A.P.; Godejohann, F.; Linnik, T.L.; Glavin, B.A.; Shelukhin, L. A.; Pattnaik, D.P.; Wang, M.; Rushforth, Andrew; Yakovlev, D.R.; Akimov, A.V.; Bayer, M.

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.

Citation

Scherbakov, A., Danilov, A., Godejohann, F., Linnik, T., Glavin, B., Shelukhin, L. A., Pattnaik, D., Wang, M., Rushforth, A., Yakovlev, D., Akimov, A., & Bayer, M. (2019). Optical excitation of single- and multi-mode magnetization precession in Fe-Ga nanolayers. Physical Review Applied, 11(3), Article 031003. https://doi.org/10.1103/PhysRevApplied.11.031003

• Journal Article Type: Letter
• Acceptance Date: Feb 9, 2019
• Online Publication Date: Mar 22, 2019
• Publication Date: Mar 22, 2019
• Deposit Date: Mar 13, 2019
• Publicly Available Date: Mar 14, 2019
• Journal: Physical Review Applied
• Electronic ISSN: 2331-7019
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 11
• Issue: 3
• Article Number: 031003
• DOI: https://doi.org/10.1103/PhysRevApplied.11.031003
• Public URL: https://nottingham-repository.worktribe.com/output/1563019
• Publisher URL: https://journals.aps.org/prapplied/abstract/10.1103/PhysRevApplied.11.031003
• Contract Date: Mar 14, 2019