2017/08/31 by Tom Ferté, T. Ferte, N. Bergeard +7
Chemistry · Materials Science · Physics and Astronomy · #Analytical Chemistry (journal) #Atomic physics #Chemistry #Demagnetizing field #Diamond and Carbon-based Materials Research #Electron #Femtosecond #Fluorescence #Laser #Magnetic field #Magnetic properties of thin films #Magnetization #Materials science #Nuclear physics #Optics #Physics #Physics of Superconductivity and Magnetism #Quenching (fluorescence) #Thermal #Thermodynamics #Ultrashort pulse #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevb.96.144427
published as Phys. Rev. B 96, 144427 (2017) · 14 pages, 3 Figures and 1 Table
arxiv created 2017/08/31 · openalex created_date 2017/09/15 · openalex publication_date 2017/10/23 · arxiv updated 2017/11/01 · openalex updated_date 2026/08/06
We have investigated ultrafast quenching of the Tb 4f magnetic order in Co74Tb26 alloys, induced by femtosecond hot-electron pulses. The hot-electron pulses were produced in specific nonmagnetic capping layers by infrared femtosecond laser pulses. Our experimental results show that subpicosecond dynamics of Tb 4f magnetic moments can be induced by nonthermal and thermal hot-electron. We further demonstrate that the demagnetization efficiencies of nonthermal and thermal hot-electron are similar. However, the characteristic demagnetization times show values of 0.35 ps for nonthermal hot-electron excitations and 1.2 ps for thermal hot-electron excitations. We explain this temporal elongation by the propagation time of thermal hot-electron through the 15-nm-thick CoTb film.