Efficient terahertz generation using Fe/Pt spintronic emitters pumped at different wavelengths
Recent studies in spintronics have highlighted ultrathin magnetic metallic multilayers as a novel and very promising class of broadband terahertz radiation sources. Such spintronic multilayers consist of ferromagnetic (FM) and non-magnetic (NM) thin films. When triggered by ultrafast laser pulses...
| Principais autores: | , , , , , , , , |
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| Outros Autores: | |
| Formato: | Journal Article |
| Idioma: | English |
| Publicado em: |
2020
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| Assuntos: | |
| Acesso em linha: | https://hdl.handle.net/10356/137181 |
| _version_ | 1826116772993957888 |
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| author | Papaioannou, Evangelos Th. Torosyan, Garik Keller, Sascha Scheuer, Laura Battiato, Marco Mag-usara, Valynn Katrine L'huillier, Johannes Tani, Masahiko Beigang, René |
| author2 | School of Physical and Mathematical Sciences |
| author_facet | School of Physical and Mathematical Sciences Papaioannou, Evangelos Th. Torosyan, Garik Keller, Sascha Scheuer, Laura Battiato, Marco Mag-usara, Valynn Katrine L'huillier, Johannes Tani, Masahiko Beigang, René |
| author_sort | Papaioannou, Evangelos Th. |
| collection | NTU |
| description | Recent studies in spintronics have highlighted ultrathin magnetic metallic
multilayers as a novel and very promising class of broadband terahertz
radiation sources. Such spintronic multilayers consist of ferromagnetic (FM)
and non-magnetic (NM) thin films. When triggered by ultrafast laser pulses,
they generate pulsed THz radiation due to the inverse spin-Hall effect, a
mechanism that converts optically driven spin currents from the magnetized FM
layer into transient transverse charge currents in the NM layer, resulting in
THz emission. As THz emitters, FM/NM multilayers have been intensively
investigated so far only at 800-nm excitation wavelength using femtosecond
Ti:sapphire lasers. In this work, we demonstrate that an optimized spintronic
bilayer structure of 2-nm Fe and 3-nm Pt grown on 500 {\mu}m MgO substrate is
just as effective as a THz radiation source when excited either at {\lambda} =
800 nm or at {\lambda} = 1550 nm by ultrafast laser pulses from a fs fiber
laser (pulse width close to 100 fs, repetition rate around 100 MHz). Even with
low incident power levels, the Fe/Pt spintronic emitter exhibits efficient
generation of THz radiation at both excitation wavelengths. The efficient THz
emitter operation at 1550 nm facilitates the integration of such spintronic
emitters in THz systems driven by relatively low cost and compact fs fiber
lasers without the need for frequency conversion. |
| first_indexed | 2024-10-01T04:16:51Z |
| format | Journal Article |
| id | ntu-10356/137181 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:16:51Z |
| publishDate | 2020 |
| record_format | dspace |
| spelling | ntu-10356/1371812023-02-28T19:49:07Z Efficient terahertz generation using Fe/Pt spintronic emitters pumped at different wavelengths Papaioannou, Evangelos Th. Torosyan, Garik Keller, Sascha Scheuer, Laura Battiato, Marco Mag-usara, Valynn Katrine L'huillier, Johannes Tani, Masahiko Beigang, René School of Physical and Mathematical Sciences Science::Physics Epitaxial Bilayers Femtosecond Lasers Recent studies in spintronics have highlighted ultrathin magnetic metallic multilayers as a novel and very promising class of broadband terahertz radiation sources. Such spintronic multilayers consist of ferromagnetic (FM) and non-magnetic (NM) thin films. When triggered by ultrafast laser pulses, they generate pulsed THz radiation due to the inverse spin-Hall effect, a mechanism that converts optically driven spin currents from the magnetized FM layer into transient transverse charge currents in the NM layer, resulting in THz emission. As THz emitters, FM/NM multilayers have been intensively investigated so far only at 800-nm excitation wavelength using femtosecond Ti:sapphire lasers. In this work, we demonstrate that an optimized spintronic bilayer structure of 2-nm Fe and 3-nm Pt grown on 500 {\mu}m MgO substrate is just as effective as a THz radiation source when excited either at {\lambda} = 800 nm or at {\lambda} = 1550 nm by ultrafast laser pulses from a fs fiber laser (pulse width close to 100 fs, repetition rate around 100 MHz). Even with low incident power levels, the Fe/Pt spintronic emitter exhibits efficient generation of THz radiation at both excitation wavelengths. The efficient THz emitter operation at 1550 nm facilitates the integration of such spintronic emitters in THz systems driven by relatively low cost and compact fs fiber lasers without the need for frequency conversion. Accepted version 2020-03-05T05:54:52Z 2020-03-05T05:54:52Z 2018 Journal Article Papaioannou, E. T., Torosyan, G., Keller, S., Scheuer, L., Battiato, M., Mag-usara, V. K., . . ., Beigang, R. (2018). Efficient terahertz generation using Fe/Pt spintronic emitters pumped at different wavelengths. IEEE Transactions on Magnetics, 54(11), 9100205-. doi:10.1109/TMAG.2018.2847031 0018-9464 https://hdl.handle.net/10356/137181 10.1109/TMAG.2018.2847031 2-s2.0-85049695313 11 54 en IEEE Transactions on Magnetics © 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. The published version is available at: https://doi.org/10.1109/TMAG.2018.2847031. application/pdf |
| spellingShingle | Science::Physics Epitaxial Bilayers Femtosecond Lasers Papaioannou, Evangelos Th. Torosyan, Garik Keller, Sascha Scheuer, Laura Battiato, Marco Mag-usara, Valynn Katrine L'huillier, Johannes Tani, Masahiko Beigang, René Efficient terahertz generation using Fe/Pt spintronic emitters pumped at different wavelengths |
| title | Efficient terahertz generation using Fe/Pt spintronic emitters pumped at different wavelengths |
| title_full | Efficient terahertz generation using Fe/Pt spintronic emitters pumped at different wavelengths |
| title_fullStr | Efficient terahertz generation using Fe/Pt spintronic emitters pumped at different wavelengths |
| title_full_unstemmed | Efficient terahertz generation using Fe/Pt spintronic emitters pumped at different wavelengths |
| title_short | Efficient terahertz generation using Fe/Pt spintronic emitters pumped at different wavelengths |
| title_sort | efficient terahertz generation using fe pt spintronic emitters pumped at different wavelengths |
| topic | Science::Physics Epitaxial Bilayers Femtosecond Lasers |
| url | https://hdl.handle.net/10356/137181 |
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