Rights statement: Copyright 2020 American Institute of Physics. The following article appeared in Applied Physics Letters, 117, 2020 and may be found at http://dx.doi.org/10.1063/5.0020020 This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.
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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Laser stimulated THz emission from Pt/CoO/FeCoB
AU - Sasaki, Y.
AU - Li, G.
AU - Moriyama, T.
AU - Ono, T.
AU - Mikhaylovskiy, R.V.
AU - Kimel, A.V.
AU - Mizukami, S.
N1 - Copyright 2020 American Institute of Physics. The following article appeared in Applied Physics Letters, 117, 2020 and may be found at http://dx.doi.org/10.1063/5.0020020 This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.
PY - 2020/11/9
Y1 - 2020/11/9
N2 - 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.
AB - 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.
KW - Antiferromagnetism
KW - Cobalt compounds
KW - Transmissions
KW - Ultrafast lasers
KW - Antiferromagnetic insulators
KW - Antiferromagnetic orderings
KW - Antiferromagnets
KW - Diffusion length
KW - Spin angular momentum
KW - Spin currents
KW - THz emission
KW - THz radiation
KW - Terahertz waves
U2 - 10.1063/5.0020020
DO - 10.1063/5.0020020
M3 - Journal article
VL - 117
JO - Applied Physics Letters
JF - Applied Physics Letters
SN - 0003-6951
IS - 19
M1 - 192403
ER -