2009/04/28 by U. Atxitia, Unai Atxitia, Atxitia, U. +12
Biochemistry, Genetics and Molecular Biology · Physics and Astronomy · #Electron Spin Resonance Studies #FOS: Physical sciences #Laser-Matter Interactions and Applications #Materials Science (cond-mat.mtrl-sci) #Spectroscopy and Quantum Chemical Studies #Statistical Mechanics (cond-mat.stat-mech) #cond-mat.mtrl-sci #cond-mat.stat-mech
paper · pdf · doi:10.48550/arxiv.0904.4399
arxiv created 2009/04/28 · openalex publication_date 2009/04/28 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We compare femtosecond pump-probe experiments in Ni and micromagnetic modelling based on the Landau-Lifshitz-Bloch equation coupled to a two-temperature model, revealing a predominant thermal ultrafast demagnetization mechanism. We show that both spin (femtosecond demagnetization) and electron-phonon (magnetization recovery) rates in Ni increase as a function of the laser pump fluence. The slowing down for high fluences arises from the increased longitudinal relaxation time.