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Spin valve as THz emitter providing amplitude modulation

Year: 2024
Type: article
Abstract: We present a novel spin-valve THz emitter composed of FeCo/TbCo2/FeCo tri-layers separated by a copper spacer, designed to provide amplitude modulation of THz radiation. The distinct coercivities of the magnetic layers enable magnetic field control of the THz emission, with the final amplitude formed by the interference of THz waves from the individual tri-layers. Experimental studies using time-domain spectroscopy reveal that the spin-valve structure, optimized for in-plane magnetic anisotropy, effectively modulates the THz signal and maintains constant polarization. Although the current optical-to-THz conversion efficiency is insufficient for commercial use, the findings offer crucial insights for enhancing efficiency through structural optimization, highlighting the potential for advanced THz emitters and modulators.
DOI: 10.1063/5.0221982
Authors: A. M. Buryakov, E. D. Mishina, E. D. Lebedeva, P. Yu. Avdeev, N. Tiercelin, S. V. Ovcharenko, A. V. Gorbatova, A. A. Klimov, A. S. Sigov, V. L. Preobrazhensky
Institutions: MIREA - Russian Technological University, Centre National de la Recherche Scientifique, Université de Lille, Institut d'Electronique, de Microélectronique et de Nanotechnologie, Université Polytechnique Hauts-de-France, Centrale Lille Institut, Prokhorov General Physics Institute
Language: English
Open Access status: gold
Estimated APC paid: $2,200
OpenAlex ID: W4403718104
FWCI: 0.707
Cites: 33
Cited by: 6
Related to: 10