All-Optical Control of Magnetization in Quantum-Confined Ultrathin Magnetic Metals
arXiv:2104.02608 · doi:10.1038/s41598-021-95319-6
Abstract
All-optical control dynamics of magnetization in sub-10 nm metallic thin films are investigated, as these films with quantum confinement undergo unique interactions with femtosecond laser pulses. Our theoretical derivations based on the free electron model show that the density of states at Fermi level (DOS_F) and electron-phonon coupling coefficients (G_ep) in ultrathin metals have very high sensitivity to film thickness within a few Angstroms. As DOS_F and G_ep depend on thickness, we show that completely different magnetization dynamics characteristics emerge compared with bulk metals. Our model suggests highly-efficient energy transfer from fs laser photons to spin waves due to minimal energy absorption by phonon. This sensitivity to thickness and efficient energy transfer offers an opportunity to obtain ultrafast on-chip magnetization dynamics.
arXiv comment21 pages, 12 pages of main manuscript, 4 main manuscript figures, 9 pages of supplementary information, 8 supplementary figures
References in corpus (16)
- Coupled spin and valley physics in monolayers of MoS2 and other group-VI dichalcogenides
- Intrinsic spin Hall effect in monolayers of group-VI dichalcogenides: A first-principles study
- Two types of all-optical magnetization switching mechanisms using femtosecond laser pulses
- Influence of quantum confinement on the ferromagnetism of (Ga,Mn)As diluted magnetic semiconductor
- Blueprint for deterministic all-optical switching of magnetization
- All-Optical Materials Design of Chiral Edge Modes in Transition-Metal Dichalcogenides
- Theory of laser-induced demagnetization at high temperatures
- Surface Reactivity and Quantum-Size effects on the Electronic Density Decay Length of ultrathin Metal Films
- Quantum size effects in Pb islands on Cu(111): Electronic-structure calculations
- Quantum well states and amplified spin-dependent Friedel oscillations in thin films
- Ultrafast Magnetization Dynamics in Diluted Magnetic Semiconductors
- First-principles calculations of Cu(001) thin films: quantum size effect in surface energetics and surface chemical reactivities
- Near-equilibrium measurement of quantum size effects using Kelvin probe force microscopy
- Microscopic Theory of Ultrafast Out-of-Equilibrium Dynamics in Magnetic Insulators. Unraveling the Magnon-Phonon Coupling
- Thermodynamically self-consistent non-stochastic micromagnetic model for the ferromagnetic state
- Tuning the laser-induced ultrafast demagnetization of transition metals