Laser-induced terahertz emission from layered synthetic magnets

Yuma Ogasawara; Yuta Sasaki; Satoshi Iihama; Akira Kamimaki; Kazuya Suzuki; Shigemi Mizukami

doi:10.35848/1882-0786/ab88c2

Laser-induced terahertz emission from layered synthetic magnets

Yuma Ogasawara, Yuta Sasaki, Satoshi Iihama, Akira Kamimaki, Kazuya Suzuki, Shigemi Mizukami

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

Abstract

We investigated laser-pulse-induced terahertz (THz) emission in Ta/CoFeB/Ir/CoFeB/Ta layered synthetic magnets with different Ir spacer thicknesses. THz emissions were observed under no applied magnetic fields for samples exhibiting interlayer antiferromagnetic exchange couplings, and those THz emissions also showed oscillatory behavior against the Ir spacer thicknesses. These results are qualitatively explained with the THz emission mechanism due to the inverse spin Hall effect for the laser-induced spin current in the layered structures. We also discuss the effect of a non-collinear configuration of magnetizations on THz emission with macrospin simulation.

Original language	English
Article number	063001
Journal	Applied Physics Express
Volume	13
Issue number	6
DOIs	https://doi.org/10.35848/1882-0786/ab88c2
Publication status	Published - 2020 Jun 1

ASJC Scopus subject areas

Engineering(all)
Physics and Astronomy(all)

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title = "Laser-induced terahertz emission from layered synthetic magnets",

abstract = "We investigated laser-pulse-induced terahertz (THz) emission in Ta/CoFeB/Ir/CoFeB/Ta layered synthetic magnets with different Ir spacer thicknesses. THz emissions were observed under no applied magnetic fields for samples exhibiting interlayer antiferromagnetic exchange couplings, and those THz emissions also showed oscillatory behavior against the Ir spacer thicknesses. These results are qualitatively explained with the THz emission mechanism due to the inverse spin Hall effect for the laser-induced spin current in the layered structures. We also discuss the effect of a non-collinear configuration of magnetizations on THz emission with macrospin simulation.",

author = "Yuma Ogasawara and Yuta Sasaki and Satoshi Iihama and Akira Kamimaki and Kazuya Suzuki and Shigemi Mizukami",

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T1 - Laser-induced terahertz emission from layered synthetic magnets

AU - Ogasawara, Yuma

AU - Sasaki, Yuta

AU - Iihama, Satoshi

AU - Kamimaki, Akira

AU - Suzuki, Kazuya

AU - Mizukami, Shigemi

PY - 2020/6/1

Y1 - 2020/6/1

N2 - We investigated laser-pulse-induced terahertz (THz) emission in Ta/CoFeB/Ir/CoFeB/Ta layered synthetic magnets with different Ir spacer thicknesses. THz emissions were observed under no applied magnetic fields for samples exhibiting interlayer antiferromagnetic exchange couplings, and those THz emissions also showed oscillatory behavior against the Ir spacer thicknesses. These results are qualitatively explained with the THz emission mechanism due to the inverse spin Hall effect for the laser-induced spin current in the layered structures. We also discuss the effect of a non-collinear configuration of magnetizations on THz emission with macrospin simulation.

AB - We investigated laser-pulse-induced terahertz (THz) emission in Ta/CoFeB/Ir/CoFeB/Ta layered synthetic magnets with different Ir spacer thicknesses. THz emissions were observed under no applied magnetic fields for samples exhibiting interlayer antiferromagnetic exchange couplings, and those THz emissions also showed oscillatory behavior against the Ir spacer thicknesses. These results are qualitatively explained with the THz emission mechanism due to the inverse spin Hall effect for the laser-induced spin current in the layered structures. We also discuss the effect of a non-collinear configuration of magnetizations on THz emission with macrospin simulation.

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Laser-induced terahertz emission from layered synthetic magnets

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