Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/137181
 Title: Efficient terahertz generation using Fe/Pt spintronic emitters pumped at different wavelengths Authors: Papaioannou, Evangelos Th.Torosyan, GarikKeller, SaschaScheuer, LauraBattiato, MarcoMag-usara, Valynn KatrineL'huillier, JohannesTani, MasahikoBeigang, René Keywords: Science::Physics Issue Date: 2018 Source: 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 Journal: IEEE Transactions on Magnetics Abstract: 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. URI: https://hdl.handle.net/10356/137181 ISSN: 0018-9464 DOI: 10.1109/TMAG.2018.2847031 Rights: © 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. Fulltext Permission: open Fulltext Availability: With Fulltext Appears in Collections: SPMS Journal Articles

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