Femtosecond Laser-Excitation-Driven High Frequency Standing Spin Waves in Nanoscale Dielectric Thin Films of Iron Garnets
- We demonstrate that femtosecond laser pulses allow triggering high-frequency standing spin-wave modes in nanoscale thin films of a bismuth-substituted yttrium iron garnet. By varying the strength of the external magnetic field, we prove that two distinct branches of the dispersion relation are excited for all the modes. This is reflected in particular at a very weak magnetic field (similar to 33 mT) by a spin dynamics with a frequency up to 15 GHz, which is 15 times higher than the one associated with the ferromagnetic resonance mode. We argue that this phenomenon is triggered by ultrafast changes of the magnetic anisotropy via laser excitation of incoherent and coherent phonons. These findings open exciting prospects for ultrafast photo magnonics.
| Author details: | Marwan DebORCiD, Elena PopovaORCiDGND, Michel HehnORCiD, Niels Keller, Sebastien Petit-Watelot, Matias BargheerORCiDGND, Stephane ManginORCiD, Gregory Malinowski |
|---|---|
| DOI: | https://doi.org/10.1103/PhysRevLett.123.027202 |
| ISSN: | 0031-9007 |
| ISSN: | 1079-7114 |
| Pubmed ID: | https://pubmed.ncbi.nlm.nih.gov/31386535 |
| Title of parent work (English): | Physical review letters |
| Publisher: | American Physical Society |
| Place of publishing: | College Park |
| Publication type: | Article |
| Language: | English |
| Date of first publication: | 2019/07/10 |
| Publication year: | 2019 |
| Release date: | 2021/01/07 |
| Volume: | 123 |
| Issue: | 2 |
| Number of pages: | 6 |
| Funding institution: | ANR-NSFFrench National Research Agency (ANR) [ANR-15-CE24-0009]; Alexander von Humboldt FellowshipAlexander von Humboldt Foundation; BMBF ProjectFederal Ministry of Education & Research (BMBF) [05K16IPA]; FEDER (EU)European Union (EU); ANRFrench National Research Agency (ANR); Metropole Grand Nancy; Region Grand Est |
| Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
| DDC classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
| Peer review: | Referiert |
| Publishing method: | Open Access / Green Open-Access |
