Efficient terahertz emission from R-plane α-Fe2O3/Pt
We report on the generation of ultrafast spin currents through femtosecond laser excitation of epitaxial bilayer thin films comprising α-Fe2O3 (an insulating antiferromagnet) and Pt (a heavy metal). The epitaxial thin films of α-Fe2O3 were simultaneously grown in three distinct orientations, namely,...
| Main Authors: | , , , , |
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| Format: | Journal Article |
| Language: | English |
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2024
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| Online Access: | https://hdl.handle.net/10356/179640 |
| _version_ | 1826119391599656960 |
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| author | Agarwal, Rekha Li, Ziqi Khan, Kacho Imtiyaz Ali Chia, Elbert E. M. Muduli, P. K. |
| author2 | School of Physical and Mathematical Sciences |
| author_facet | School of Physical and Mathematical Sciences Agarwal, Rekha Li, Ziqi Khan, Kacho Imtiyaz Ali Chia, Elbert E. M. Muduli, P. K. |
| author_sort | Agarwal, Rekha |
| collection | NTU |
| description | We report on the generation of ultrafast spin currents through femtosecond laser excitation of epitaxial bilayer thin films comprising α-Fe2O3 (an insulating antiferromagnet) and Pt (a heavy metal). The epitaxial thin films of α-Fe2O3 were simultaneously grown in three distinct orientations, namely, R, A, and C planes, employing pulsed laser deposition. By using the R plane α-Fe2O3, we demonstrate a substantial enhancement of the THz signal, nearly one order of magnitude greater compared to the A and C planes α-Fe2O3/Pt. We perform a detailed investigation into the sample azimuthal and laser polarization dependence of the THz emission. Our investigations establish that the sample azimuthal dependence of THz emission in the α-Fe2O3/Pt system is linked to the spin domain distribution as well as the crystalline symmetry of the orientation of α-Fe2O3. These results contribute significantly to understanding the ultrafast dynamics of spin currents in antiferromagnets. |
| first_indexed | 2024-10-01T04:59:13Z |
| format | Journal Article |
| id | ntu-10356/179640 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:59:13Z |
| publishDate | 2024 |
| record_format | dspace |
| spelling | ntu-10356/1796402024-08-19T15:35:03Z Efficient terahertz emission from R-plane α-Fe2O3/Pt Agarwal, Rekha Li, Ziqi Khan, Kacho Imtiyaz Ali Chia, Elbert E. M. Muduli, P. K. School of Physical and Mathematical Sciences Physics Antiferromagnets Bilayer thin films We report on the generation of ultrafast spin currents through femtosecond laser excitation of epitaxial bilayer thin films comprising α-Fe2O3 (an insulating antiferromagnet) and Pt (a heavy metal). The epitaxial thin films of α-Fe2O3 were simultaneously grown in three distinct orientations, namely, R, A, and C planes, employing pulsed laser deposition. By using the R plane α-Fe2O3, we demonstrate a substantial enhancement of the THz signal, nearly one order of magnitude greater compared to the A and C planes α-Fe2O3/Pt. We perform a detailed investigation into the sample azimuthal and laser polarization dependence of the THz emission. Our investigations establish that the sample azimuthal dependence of THz emission in the α-Fe2O3/Pt system is linked to the spin domain distribution as well as the crystalline symmetry of the orientation of α-Fe2O3. These results contribute significantly to understanding the ultrafast dynamics of spin currents in antiferromagnets. Ministry of Education (MOE) Published version The partial support from the Ministry of Human Resource Development under the IMPRINT program (Grants No. 7519 and No. 7058), the Department of Electronics and Information Technology (DeitY), the Science and Engineering Research Board (SERB File No. CRG/2018/001012 and No. CRG/2022/002821), Joint Advanced Technology Centre at IIT Delhi, Grand Challenge Project, IIT Delhi, and the Department of Science and Technology under the Nanomission program [Grant No. SR/NM/NT-1041/2016(G)] are gratefully acknowledged. This work was supported by the Singapore Ministry of Education AcRF Tier 3 Programme “Geometrical Quantum Materials” (Grant No. MOE2018-T3-1-002), and AcRF Tier 2 “Dynamical characterization of the spin-to-charge conversion mechanisms in 2D heterostructures” (Grant No. MOE-T2EP50222-0014). R.A. acknowledges support from the Council of Scientific and Industrial Research (CSIR), India and India Connect @ NTU Visiting Research Student Programme. 2024-08-14T01:07:13Z 2024-08-14T01:07:13Z 2024 Journal Article Agarwal, R., Li, Z., Khan, K. I. A., Chia, E. E. M. & Muduli, P. K. (2024). Efficient terahertz emission from R-plane α-Fe2O3/Pt. Physical Review B, 109(22), 224408-. https://dx.doi.org/10.1103/PhysRevB.109.224408 2469-9950 https://hdl.handle.net/10356/179640 10.1103/PhysRevB.109.224408 2-s2.0-85195212961 22 109 224408 en MOE 2018-T3-1-002 MOE-T2EP50222-0014 Physical Review B © 2024 American Physical Society. All rights reserved. This article may be downloaded for personal use only. Any other use requires prior permission of the copyright holder. The Version of Record is available online at http://doi.org/10.1103/PhysRevB.109.224408 application/pdf |
| spellingShingle | Physics Antiferromagnets Bilayer thin films Agarwal, Rekha Li, Ziqi Khan, Kacho Imtiyaz Ali Chia, Elbert E. M. Muduli, P. K. Efficient terahertz emission from R-plane α-Fe2O3/Pt |
| title | Efficient terahertz emission from R-plane α-Fe2O3/Pt |
| title_full | Efficient terahertz emission from R-plane α-Fe2O3/Pt |
| title_fullStr | Efficient terahertz emission from R-plane α-Fe2O3/Pt |
| title_full_unstemmed | Efficient terahertz emission from R-plane α-Fe2O3/Pt |
| title_short | Efficient terahertz emission from R-plane α-Fe2O3/Pt |
| title_sort | efficient terahertz emission from r plane α fe2o3 pt |
| topic | Physics Antiferromagnets Bilayer thin films |
| url | https://hdl.handle.net/10356/179640 |
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