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Title: Spintronic terahertz emitters in silicon-based heterostructures
Authors: Liu, Jiayun
Lee, Kyusup
Yang, Yingshu
Li, Ziqi
Sharma, Raghav
Xi, Lifei
Salim, Teddy
Boothroyd, Chris
Lam, Yeng Ming
Yang, Hyunsoo
Battiato, Marco
Chia, Elbert E. M.
Keywords: Engineering::Materials
Issue Date: 2022
Source: Liu, J., Lee, K., Yang, Y., Li, Z., Sharma, R., Xi, L., Salim, T., Boothroyd, C., Lam, Y. M., Yang, H., Battiato, M. & Chia, E. E. M. (2022). Spintronic terahertz emitters in silicon-based heterostructures. Physical Review Applied, 18(3), 034056-.
Project: MOE2018-T3-1-002 
Journal: Physical Review Applied 
Abstract: Integration of active elements into silicon wafers is the first step towards their usage in modern electronic devices based on nanometric structures. Spintronic terahertz emitters, typically composed of nanometer-thin magnetic multilayer, have the outstanding capability of producing high-quality, broadband terahertz pulses using extremely simple heterostructures. A question remains on whether an efficient and cheap integration with other silicon-based technologies can be achieved. We show here that simply having a ferromagnetic layer on silicon produces remarkably efficient spintronic terahertz emission despite the low spin-orbit coupling of the individual components. We achieve this by leveraging on the natural formation of silicides at the interface of a transition metal and silicon. The cobalt silicide layer has good spin-to-charge conversion efficiency that reaches around 1/6 as that of the prototypical spintronics THz-emitter heterostructure cobalt/platinum.
ISSN: 2331-7019
DOI: 10.1103/PhysRevApplied.18.034056
Schools: School of Materials Science and Engineering 
School of Physical and Mathematical Sciences 
Research Centres: Facility for Analysis, Characterisation, Testing and Simulation 
Rights: © 2022 American Physical Society. All rights reserved. This paper was published in Physical Review Applied and is made available with permission of American Physical Society.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles
SPMS Journal Articles

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