Modelling of spintronic terahertz emitters as a function of spin generation and diffusion geometry

Spintronic THz emitters (STE) are efficient THz sources constructed using thin heavy-metal (HM) and ferromagnetic-metal (FM) layers. To improve the performance of the STE, different structuring methods (trilayers, stacked bilayers) have been experimentally applied. A theoretical description of th...

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Main Authors: Yang, Yingshu, Dal Forno, Stefano, Battiato, Marco
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2023
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Online Access:https://hdl.handle.net/10356/169908
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1699082023-08-14T15:34:49Z Modelling of spintronic terahertz emitters as a function of spin generation and diffusion geometry Yang, Yingshu Dal Forno, Stefano Battiato, Marco School of Physical and Mathematical Sciences Science::Physics Diffusion Geometries Emission Process Spintronic THz emitters (STE) are efficient THz sources constructed using thin heavy-metal (HM) and ferromagnetic-metal (FM) layers. To improve the performance of the STE, different structuring methods (trilayers, stacked bilayers) have been experimentally applied. A theoretical description of the overall THz emission process is necessary to optimize the efficiency of STE. In particular, geometry, composition, pump laser frequency, and spin diffusion will be significant in understanding the pathways for further research developments. This work will apply a generalized model based on a modified Transfer Matrix Method (TMM). We will consider the spin generation and diffusion in the FM and HM layers and explain the spintronic THz emission process. This model is suitable for calculating emitted THz signal as a function of FM and HM thicknesses for different geometrical configurations. We will investigate a bilayer geometry as a test case, but the extension to a multi-layer configuration is straightforward. We will show how the different configurations of the sample will influence the THz emission amplitude. Nanyang Technological University Published version M.B. acknowledges Nanyang Technological University, NAP-SUG. 2023-08-14T07:27:27Z 2023-08-14T07:27:27Z 2022 Journal Article Yang, Y., Dal Forno, S. & Battiato, M. (2022). Modelling of spintronic terahertz emitters as a function of spin generation and diffusion geometry. Physical Review B, 107(14), 144407-1-144407-8. https://dx.doi.org/10.1103/PhysRevB.107.144407 1098-0121 https://hdl.handle.net/10356/169908 10.1103/PhysRevB.107.144407 2-s2.0-85152145595 14 107 144407-1 144407-8 en NAP-SUG Physical Review B © 2023 American Physical Society. All rights reserved. This paper was published in Physical Review B and is made available with permission of American Physical Society. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Science::Physics
Diffusion Geometries
Emission Process
spellingShingle Science::Physics
Diffusion Geometries
Emission Process
Yang, Yingshu
Dal Forno, Stefano
Battiato, Marco
Modelling of spintronic terahertz emitters as a function of spin generation and diffusion geometry
description Spintronic THz emitters (STE) are efficient THz sources constructed using thin heavy-metal (HM) and ferromagnetic-metal (FM) layers. To improve the performance of the STE, different structuring methods (trilayers, stacked bilayers) have been experimentally applied. A theoretical description of the overall THz emission process is necessary to optimize the efficiency of STE. In particular, geometry, composition, pump laser frequency, and spin diffusion will be significant in understanding the pathways for further research developments. This work will apply a generalized model based on a modified Transfer Matrix Method (TMM). We will consider the spin generation and diffusion in the FM and HM layers and explain the spintronic THz emission process. This model is suitable for calculating emitted THz signal as a function of FM and HM thicknesses for different geometrical configurations. We will investigate a bilayer geometry as a test case, but the extension to a multi-layer configuration is straightforward. We will show how the different configurations of the sample will influence the THz emission amplitude.
author2 School of Physical and Mathematical Sciences
author_facet School of Physical and Mathematical Sciences
Yang, Yingshu
Dal Forno, Stefano
Battiato, Marco
format Article
author Yang, Yingshu
Dal Forno, Stefano
Battiato, Marco
author_sort Yang, Yingshu
title Modelling of spintronic terahertz emitters as a function of spin generation and diffusion geometry
title_short Modelling of spintronic terahertz emitters as a function of spin generation and diffusion geometry
title_full Modelling of spintronic terahertz emitters as a function of spin generation and diffusion geometry
title_fullStr Modelling of spintronic terahertz emitters as a function of spin generation and diffusion geometry
title_full_unstemmed Modelling of spintronic terahertz emitters as a function of spin generation and diffusion geometry
title_sort modelling of spintronic terahertz emitters as a function of spin generation and diffusion geometry
publishDate 2023
url https://hdl.handle.net/10356/169908
_version_ 1779156799131222016