Ultrafast X-Ray Induced Changes of the Electronic and Magnetic Response of Solids Due to Valence Electron Redistribution
arXiv:1902.04611 · doi:10.1038/s41467-019-13272-5
Abstract
We report a novel mechanism, consisting of redistribution of valence electrons near the Fermi level, during interactions of intense femtosecond X-ray pulses with a Co/Pd multilayer. The changes in Co 3d valence shell occupation were directly revealed by fluence-dependent changes of the Co L X-ray absorption and magnetic circular dichroism spectra near the excitation threshold. The valence shell redistribution arises from inelastic scattering of high energy Auger electrons and photoelectrons that lead to transient holes below and electrons above the Fermi level on the femtosecond time scale. The valence electron reshuffling effect scales with the energy deposited by X-rays and within 17 fs extends to valence states within 2 eV of the Fermi level. As a consequence the sample demagnetizes by more than twenty percent due to magnon generation.
arXiv comment8 pages, 4 figures
References in corpus (10)
- Super-Diffusive Spin-Transport as a Mechanism of Ultrafast Demagnetization
- Ab initio investigation of Elliott-Yafet electron-phonon mechanism in laser-induced ultrafast demagnetization
- Electron Cascades Produced by Photoelectrons in Diamond
- THz-driven ultrafast spin-lattice scattering in amorphous metallic ferromagnets
- Statistical and coherence properties of radiation from X-ray free electron lasers
- Role of Spin Flips versus Spin Transport in Non Thermal Electrons Excited by Ultrashort Optical Pulses in Transition Metals
- Influence of laser-excited electron distributions on the x-ray magnetic circular dichroism spectra: Implications for femtosecond demagnetization in Ni
- Revealing the nature of the ultrafast magnetic phase transition in Ni by correlating extreme ultraviolet magneto-optic and photoemission spectroscopies
- Femtosecond X-ray magnetic circular dichroism absorption spectroscopy at an X-ray free electron laser
- Creation of X-Ray Transparency of Matter by Stimulated Elastic Forward Scattering
Cited by in corpus (14)
- Ultrafast renormalization of the onsite Coulomb repulsion in a cuprate superconductor
- All-optical switching on the nanometer scale excited and probed with femtosecond extreme ultraviolet pulses
- Ultrafast demagnetization in ferromagnetic materials: Origins and progress
- Photon shot-noise limited transient absorption soft X-ray spectroscopy at the European XFEL
- Ab initio investigation of laser-induced ultrafast demagnetization of L1 FePt: Intensity dependence and importance of electron coherence
- X-ray detection of ultrashort spin current pulses in synthetic antiferromagnets
- Ultrafast Opto-magnetic Effects in the Extreme Ultraviolet Spectral Range
- Electron Dynamics at High-Energy Densities in Nickel from Non-linear Resonant X-ray Absorption Spectra
- Electronic origin of x-ray absorption peak shifts
- A Rate Model of Electron Populations for Non-linear High-Fluence X-ray Absorption Near-Edge Spectra
- Ultrafast behavior of induced and intrinsic magnetic moments in CoFeB/Pt bilayers probed by element-specific measurements in the extreme ultraviolet spectral range
- Atom-Specific Probing of Electron Dynamics in an Atomic Adsorbate by Time-Resolved X-ray Spectroscopy
- Time-resolved X-ray Spectroscopy from the Atomic Orbital Ground State Up
- Bi-cross validation for estimating spectral clustering hyper parameters