2024/12/29 by José Solano, Solano, José, Quentin Rossi +12
Physics and Astronomy · #FOS: Physical sciences #Magnetic properties of thin films #Materials Science (cond-mat.mtrl-sci) #Other Condensed Matter (cond-mat.other) #Quantum and electron transport phenomena
paper · pdf · doi:10.48550/arxiv.2412.20531
openalex publication_date 2024/12/29 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
An electric current flowing in a ferromagnetic metal carries spin angular momentum, i.e. it is spin-polarized. Here, we measure the spin-wave Doppler shift induced by the transfer of angular momentum from the diffusive spin-polarized electric current onto coherent spin waves in epitaxial MgO/Fe/MgO thin films. We follow this Doppler shift as function of the temperature and determine that the degree of spin-polarization of the current increases from 77% to 86% when cooling the device from 303K down to 10K. Interpreting these measurements within the two-current model, we separate the contributions from electron-surface, electron-phonon and electron-magnon scatterings to the spin-dependent resistivity of Fe.