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 a 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 303 to 10 K. 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 iron.

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• Magnetization dynamics
• Magnons
• Phonons
• Spin current
• Spin polarization
• Spin transfer torque
• Spin-orbit coupling
• Spintronics
• Single crystal materials
• Ferromagnetic resonance