Chiral-phonon generation of orbital currents in light transition metals
Fuente:
arXiv
Gespeichert in:
| Hauptverfasser: | , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Veröffentlicht: |
2025
|
| Schlagworte: | |
| Online-Zugang: | |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| _version_ | 1866917134300348416 |
|---|---|
| author | Rovirola, Marc Òdena, Júlia Castellví, Anna Badosa, Quim Casals, Blai Gudín, Adrián Madathil, Haripriya Ajejas, Fernando Perna, Paolo Hernández-Mínguez, Alberto Hernández, Joan Manel Vélez, Saül Macià, Ferran |
| author_facet | Rovirola, Marc Òdena, Júlia Castellví, Anna Badosa, Quim Casals, Blai Gudín, Adrián Madathil, Haripriya Ajejas, Fernando Perna, Paolo Hernández-Mínguez, Alberto Hernández, Joan Manel Vélez, Saül Macià, Ferran |
| contents | Orbital angular momentum offers a new channel for information transport in a vast set of materials. Its coherent generation and detection remain, however, largely unexplored. Here, we demonstrate that chiral surface acoustic waves (SAWs) generate sizable orbital currents in light-metal/ferromagnet bilayers through both the acoustic orbital Hall effect and acoustic orbital pumping. Using symmetry analysis of SAW-driven voltages, we disentangle vorticity-sensitive orbital currents arising from lattice rotation in the non-magnetic layer from angular-momentum pumping from the ferromagnet. Strong signals are observed only in nickel/chromium and nickel/titanium, while nickel/aluminum and all cobalt-based bilayers show negligible responses, revealing the critical roles of orbital Hall conductivity, phonon-orbital coupling, and interfacial orbital transparency. Comparison with spin-torque ferromagnetic resonance and second-harmonic measurements -- where electrically driven orbital angular momentum are weaker -- demonstrates that phonon excitation generates orbital currents more efficiently. These results establish chiral SAWs as an effective route for orbitronic functionality and open pathways toward phonon-controlled orbital magnetism. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_08385 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Chiral-phonon generation of orbital currents in light transition metals Rovirola, Marc Òdena, Júlia Castellví, Anna Badosa, Quim Casals, Blai Gudín, Adrián Madathil, Haripriya Ajejas, Fernando Perna, Paolo Hernández-Mínguez, Alberto Hernández, Joan Manel Vélez, Saül Macià, Ferran Materials Science Orbital angular momentum offers a new channel for information transport in a vast set of materials. Its coherent generation and detection remain, however, largely unexplored. Here, we demonstrate that chiral surface acoustic waves (SAWs) generate sizable orbital currents in light-metal/ferromagnet bilayers through both the acoustic orbital Hall effect and acoustic orbital pumping. Using symmetry analysis of SAW-driven voltages, we disentangle vorticity-sensitive orbital currents arising from lattice rotation in the non-magnetic layer from angular-momentum pumping from the ferromagnet. Strong signals are observed only in nickel/chromium and nickel/titanium, while nickel/aluminum and all cobalt-based bilayers show negligible responses, revealing the critical roles of orbital Hall conductivity, phonon-orbital coupling, and interfacial orbital transparency. Comparison with spin-torque ferromagnetic resonance and second-harmonic measurements -- where electrically driven orbital angular momentum are weaker -- demonstrates that phonon excitation generates orbital currents more efficiently. These results establish chiral SAWs as an effective route for orbitronic functionality and open pathways toward phonon-controlled orbital magnetism. |
| title | Chiral-phonon generation of orbital currents in light transition metals |
| topic | Materials Science |
| url | https://arxiv.org/abs/2512.08385 |