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

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 scatterin...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 2018-09, Vol.57 (9), p.90307
Main Authors: Shin, Im-Hyuk, Min, Byoung-Chul, Ju, Byeong-Kwon, Choi, Gyung-Min
Format: Article
Language:English
Subjects:
Accumulation
Copper
Demagnetization
Electron spin
Electrons
Ferromagnetism
Hot electrons
Nickel
Optical pumping
Scattering
Spin dynamics
Spintronics
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Summary: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.
ISSN:0021-4922
1347-4065
DOI:10.7567/JJAP.57.090307