Journal
ISCIENCE
Volume 25, Issue 7, Pages -Publisher
CELL PRESS
DOI: 10.1016/j.isci.2022.104615
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Funding
- Femtosecond Spectroscopy Unit, Okinawa Institute of Science and Technology Graduate University
- JKA Foundation
- AUTORACE
- SEI Group CSR Foundation
- Samco Science and Technology Foundation
- Izumi Science and Technology Foundation
- Japan Society for the Promotion of Science KAKENHI [22K04924]
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This study investigates the pump wavelength dependence of terahertz emission from an optimized Fe/Pt spintronic bilayer on MgO substrate. The results show the sensitivity of spintronic terahertz emission to both the optical absorptance of the heterostructure and the energy-dependent spin transport.
Terahertz emission from ferromagnetic/non-magnetic spintronic heterostruc-tures had been demonstrated as pump wavelength-independent. We report, however, the pump wavelength dependence of terahertz emission from an opti-mized 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 similar to 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 op-tical absorptance of the heterostructure and the energy-dependent spin trans-port, as dictated by the properties of the metallic thin films.
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