Phonon-tunable THz magnonic emission in multiferroic heterostructures
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| author | Massabeau, Sylvain Abdelsamie, Amr Godel, Florian Miljevic, Filip Rezi, Noela Gemeiner, Pascale Bouzehouane, Karim Buttiens, Thomas Dhillon, Sukhdeep Maroutian, Thomas George, Jean-Marie Jaffres, Henri Dkhil, Brahim Fusil, Stephane Garcia, Vincent Lebrun, Romain |
| author_facet | Massabeau, Sylvain Abdelsamie, Amr Godel, Florian Miljevic, Filip Rezi, Noela Gemeiner, Pascale Bouzehouane, Karim Buttiens, Thomas Dhillon, Sukhdeep Maroutian, Thomas George, Jean-Marie Jaffres, Henri Dkhil, Brahim Fusil, Stephane Garcia, Vincent Lebrun, Romain |
| contents | Collective excitations such as magnons and polar phonons provide natural access to the terahertz (THz) regime, but efficient generation and tunability remain elusive. Multiferroic BiFeO3 combines both orders at room temperature, offering a unique platform for narrowband THz emission. Here, we achieve efficient sub-bandgap optical rectification of coupled phonon-polaritons near 2 THz in bare epitaxial thin films. In Pt/BiFeO3 bilayers, we demonstrate that coupling the electromagnon branch with ultrafast strain waves, optically generated in Pt layers with various thicknesses, can produce tunable and narrowband emission between 0.4-0.8 THz. These results uncover the intertwined role of phonons, magnons, and magneto-acoustic dynamics in antiferromagnetic multiferroics, and establish these hybrid platforms as versatile engineered narrowband THz sources. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_21596 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Phonon-tunable THz magnonic emission in multiferroic heterostructures Massabeau, Sylvain Abdelsamie, Amr Godel, Florian Miljevic, Filip Rezi, Noela Gemeiner, Pascale Bouzehouane, Karim Buttiens, Thomas Dhillon, Sukhdeep Maroutian, Thomas George, Jean-Marie Jaffres, Henri Dkhil, Brahim Fusil, Stephane Garcia, Vincent Lebrun, Romain Mesoscale and Nanoscale Physics Materials Science Optics Collective excitations such as magnons and polar phonons provide natural access to the terahertz (THz) regime, but efficient generation and tunability remain elusive. Multiferroic BiFeO3 combines both orders at room temperature, offering a unique platform for narrowband THz emission. Here, we achieve efficient sub-bandgap optical rectification of coupled phonon-polaritons near 2 THz in bare epitaxial thin films. In Pt/BiFeO3 bilayers, we demonstrate that coupling the electromagnon branch with ultrafast strain waves, optically generated in Pt layers with various thicknesses, can produce tunable and narrowband emission between 0.4-0.8 THz. These results uncover the intertwined role of phonons, magnons, and magneto-acoustic dynamics in antiferromagnetic multiferroics, and establish these hybrid platforms as versatile engineered narrowband THz sources. |
| title | Phonon-tunable THz magnonic emission in multiferroic heterostructures |
| topic | Mesoscale and Nanoscale Physics Materials Science Optics |
| url | https://arxiv.org/abs/2511.21596 |