2018/12/04 by A. V. Scherbakov, A.V. Scherbakov, A. P. Danilov +18 · 1 citation
Engineering · Materials Science · Physics and Astronomy · #Excitation #Femtosecond #Laser #Magnetic Properties and Applications #Magnetic properties of thin films #Magnetization #Magnetization dynamics #Metallic Glasses and Amorphous Alloys #Microwave #Precession #Ultrashort pulse #cond-mat.mes-hall #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevapplied.11.031003
published as Phys. Rev. Applied 11, 031003 (2019)
arxiv created 2018/12/04 · openalex created_date 2018/12/11 · openalex publication_date 2019/03/22 · arxiv updated 2019/03/27 · openalex updated_date 2026/08/05
Nanoscale microwave generators based on magnetization precession require a narrow and tunable spectral band, high absolute amplitude, and high-frequency tunability---a challenging combination. The authors show that this combination can be achieved under ultrafast optical excitation of a nanolayer of galfenol, a ferromagnetic alloy of iron and gallium. In a film several nanometers thick, a femtosecond laser pulse excites only the ground spin-wave mode, not the higher-order modes that would broaden the precession spectral band. The extremely narrow spectral response remains easily detectable above 100 GHz, which is a boon for applications in nanomagnetism and spintronics.