Ultrafast spin current generated by electron-magnon scattering in bulk of ferromagnets
- Ultrafast spin current generated by electron-magnon scattering in bulk of ferromagnets
- 민병철; 신임혁; 주병권; 최경민
- Issue Date
- Japanese Journal of Applied Physics, Part 1- Regular Papers
- VOL 57-090307-5
- The ultrafast demagnetization of metallic ferromagnets can generate a spin current in metallic nonmagnets in a ferromagnet/nonmagnet structure. Two different mechanisms for this phenomenon have been suggested: spin-dependent transport of hot electrons and spin generation by electron– magnon scattering. In this work, we optically measure a transient spin accumulation on a nonmagnetic Cu layer driven by the ultrafast demagnetization of a ferromagnet (Fe, Co, and Ni). The modeling based on the spin generation by electron– magnon scattering in bulk ferromagnets (namely, bulk spin pumping) well explains the dynamics and magnitude of the measured spin accumulation on Cu.
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