Laser stimulated THz emission from Pt/CoO/FeCoB

Yuta Sasaki, Guanqiao Li, Takahiro Moriyama, Teruo Ono, Rostislav V. Mikhaylovskiy, Alexey V. Kimel, Shigemi Mizukami

Research output: Contribution to journalArticlepeer-review

Abstract

The antiferromagnetic order can mediate a transmission of the spin angular momentum flow, or the spin current, in the form of propagating magnons. In this work, we perform laser stimulated THz emission measurements on Pt/CoO/FeCoB multilayers to investigate the spin current transmission through CoO, an antiferromagnetic insulator, on a picosecond timescale. The results reveal a spin current transmission through CoO with the diffusion length of 3.0 nm. In addition, rotation of the polarization of the emitted THz radiation was observed, suggesting an interaction between the propagating THz magnons and the Néel vector in CoO. Our results not only demonstrate the picosecond magnon spin current transmission but also the picosecond interaction of the THz magnons with the Néel vector in the antiferromagnet.

Original languageEnglish
Article number192403
JournalApplied Physics Letters
Volume117
Issue number19
DOIs
Publication statusPublished - 2020 Nov 9

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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