Optimum excitation wavelength and photon energy threshold for spintronic terahertz emission from Fe/Pt bilayer

Material type: 文書・図像類

Author: Mag-usara, Valynn Katrineほか

Publisher: Cell Press

Publication date: 2022-07-15

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Note (General)：: Terahertz emission from ferromagnetic/non-magnetic spintronic heterostructures had been demonstrated as pump wavelength-independent. We report, howeve...

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Material Type: 文書・図像類
Title: Optimum excitation wavelength and photon energy threshold for spintronic terahertz emission from Fe/Pt bilayer
Author/Editor: Mag-usara, Valynn Katrine
Escaño, Mary Clare
Petoukhoff, Christopher E.
Torosyan, Garik
Scheuer, Laura
Madéo, Julien
Afalla, Jessica
Talara, Miezel
Muldera, Joselito E.
Kitahara, Hideaki
Bacon, David R.
Nakajima, Makoto
Dani, Keshav
Papaioannou, Evangelos Th.
Beigang, René
Tani, Masahiko
Author Heading: Mag-usara, Valynn Katrine
Escaño, Mary Clare
Petoukhoff, Christopher E.
Torosyan, Garik
Scheuer, Laura
Madéo, Julien
Afalla, Jessica
Talara, Miezel
Muldera, Joselito E.
Kitahara, Hideaki
Bacon, David R.
Nakajima, Makoto
Dani, Keshav
Papaioannou, Evangelos Th.
Beigang, René
Tani, Masahiko
Publication, Distribution, etc.: Cell Press
Publication Date: 2022-07-15
Publication Date (W3CDTF): 2022-07-15
Alternative Title: Optimum excitation wavelength and photon energy threshold for spintronic terahertz emission from Fe/Pt bilayer
Periodical title: iScience
No. or year of volume/issue: 25 7
Volume: 25
Issue: 7
Pages: 1-16
Text Language Code: eng
Target Audience: 一般
Note (General): Terahertz emission from ferromagnetic/non-magnetic spintronic heterostructures had been demonstrated as pump wavelength-independent. We report, however, the pump wavelength dependence of terahertz emission from an optimized Fe/Pt spintronic bilayer on MgO substrate. Maximum terahertz generation per total pump power was observed in the 1200- to 1800-nm pump wavelength range, and a marked decrease in the terahertz emission efficiency beyond 2500 nm (pump photon energies <0.5 eV) suggests a ∼0.35-eV threshold pump photon energy for effective spintronic terahertz emission. The inferred threshold is supported by previous theoretical results on the onset energy of significant spin-filtering at the Fe-Pt interface, and confirmed by Fe/Pt electronic structure calculations in this present work. The results of terahertz time-domain emission spectroscopy show the sensitivity of spintronic terahertz emission to both the optical absorptance of the heterostructure and the energy-dependent spin transport, as dictated by the properties of the metallic thin films.
source:https://www.sciencedirect.com/science/article/pii/S2589004222008872
Access Restrictions: 限定公開
Rights (production): cc-by
Related Material (DOI): 10.1016/j.isci.2022.104615
Data Provider (Database): 国立情報学研究所 : 学術機関リポジトリデータベース（IRDB）（機関リポジトリ）
https://irdb.nii.ac.jp
Original Data Provider (Database): 福井大学 : 福井大学学術機関リポジトリ