Ultrafast spin current generated by electron-magnon scattering in bulk of ferromagnets

Title
Ultrafast spin current generated by electron-magnon scattering in bulk of ferromagnets
Authors
민병철신임혁주병권최경민
Issue Date
2018-08
Publisher
Japanese Journal of Applied Physics, Part 1- Regular Papers
Citation
VOL 57-090307-5
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/67934
ISSN
0021-4922
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KIST Publication > Article
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