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arXiv · 1812.01237

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

A. V. Scherbakov·A. P. Danilov·F. Godejohann·T. L. Linnik·B. A. Glavin·L. A. Shelukhin·D. P. Pattnaik·M. Wang·A. W. Rushforth·D. R. Yakovlev·A. V. Akimov·M. Bayer
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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 120-nm layer, and a single mode with effective damping $α_{eff}$ = 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 magnetization precession approaching THz frequencies should be possible with Galfenol nanolayers.

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A. V. Scherbakov, A. P. Danilov, F. Godejohann, T. L. Linnik, B. A. Glavin, L. A. Shelukhin, D. P. Pattnaik, M. Wang, A. W. Rushforth, D. R. Yakovlev, A. V. Akimov, M. Bayer. 2018-12-04. Optical excitation of single- and multi-mode magnetization precession in Galfenol nanolayers. https://doi.org/10.1103/physrevapplied.11.031003

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