Strain-induced Anisotropic Terahertz Emission From a $\mathrm{Fe}(211)/\mathrm{Pt}(110)$ Bilayer

Strain-induced Anisotropic Terahertz Emission From a $Fe (211) / Pt (110)$ Bilayer

C.Q. Liu, W.-T. Lu, Z.X. Wei, Y.F. Miao, P. Wang, H. Xia, Y.P. Liu, F.L. Zeng, J.R. Zhang, C. Zhou, H.B. Zhao, Y.Z. Wu, Z. Yuan, and J. Qi

Phys. Rev. Applied 15, 044022 – Published 13 April 2021

Abstract

Terahertz (THz) emission from a $Fe (211) / Pt (110)$ bilayer grown on $Mg O (110)$ is systematically investigated. The intensity of the emitted THz wave strongly depends on the magnetization (M) orientation, and the measured THz field is 11% larger for M|| $Pt [1 \bar{1} 0]$ than for M||Pt[001]. Using first-principles calculations combined with the superdiffusive spin-transport model, we reveal that the lattice distortion induced by epitaxial strain causes anisotropic behavior of the electronic conductance and spin Hall conductivity, which eventually lead to the aforementioned experimental observations. Our studies thus provide a route to modify THz emission utilizing the intrinsic crystal-structure degree of freedom.

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Received 2 February 2021
Accepted 25 March 2021

DOI:https://doi.org/10.1103/PhysRevApplied.15.044022

Physics Subject Headings (PhySH)

Magneto-optical effect Optoelectronics Spintronics Strain

Magnetic multilayers Optical sources & detectors

First-principles calculations Terahertz techniques

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

C.Q. Liu ^1,†, W.-T. Lu ^2,†, Z.X. Wei^3,†, Y.F. Miao², P. Wang¹, H. Xia¹, Y.P. Liu ³, F.L. Zeng¹, J.R. Zhang ¹, C. Zhou ¹, H.B. Zhao⁴, Y.Z. Wu ^1,5,*, Z. Yuan ^2,‡, and J. Qi^3,§

¹Department of Physics, State Key Laboratory of Surface Physics, Fudan University, Shanghai 200433, China
²The Center for Advanced Quantum Studies and Department of Physics, Beijing Normal University, Beijing 100875, China
³State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China
⁴Shanghai Ultra-precision Optical Manufacturing Engineering Research Center, and Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Department of Optical Science and Engineering, Fudan University, Shanghai 200433, China
⁵Shanghai Research Center for Quantum Sciences, Shanghai 201315, China

^*wuyizheng@fudan.edu.cn
^†These authors contributed equally.
^‡zyuan@bnu.edu.cn
^§jbqi@uestc.edu.cn

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Vol. 15, Iss. 4 — April 2021

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Physical Review Applied

Strain-induced Anisotropic Terahertz Emission From a Fe(211)/Pt(110) Bilayer

C.Q. Liu, W.-T. Lu, Z.X. Wei, Y.F. Miao, P. Wang, H. Xia, Y.P. Liu, F.L. Zeng, J.R. Zhang, C. Zhou, H.B. Zhao, Y.Z. Wu, Z. Yuan, and J. Qi

Phys. Rev. Applied 15, 044022 – Published 13 April 2021

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Strain-induced Anisotropic Terahertz Emission From a $Fe (211) / Pt (110)$ Bilayer