Finite-size effects in ultrafast remagnetization dynamics of FePt
- We investigate the ultrafast magnetization dynamics of FePt in the L1(0) phase after an optical heating pulse, as used in heat-assisted magnetic recording. We compare continuous and nano-granular thin films and emphasize the impact of the finite size on the remagnetization dynamics. The remagnetization speeds up significantly with increasing external magnetic field only for the continuous film, where domain-wall motion governs the dynamics. The ultrafast remagnetization dynamics in the continuous film are only dominated by heat transport in the regime of high magnetic fields, whereas the timescale required for cooling is prevalent in the granular film for all magnetic field strengths. These findings highlight the necessary conditions for studying the intrinsic heat transport properties in magnetic materials.
| Author details: | Lisa WilligORCiDGND, Alexander von ReppertORCiD, Marwan DebORCiD, F. Ganss, O. Hellwig, Matias BargheerORCiDGND |
|---|---|
| DOI: | https://doi.org/10.1103/PhysRevB.100.224408 |
| ISSN: | 2469-9950 |
| ISSN: | 2469-9969 |
| Title of parent work (English): | Physical review : B, Condensed matter and materials physics |
| Publisher: | American Physical Society |
| Place of publishing: | College Park |
| Publication type: | Article |
| Language: | English |
| Year of first publication: | 2019 |
| Publication year: | 2019 |
| Release date: | 2020/09/14 |
| Volume: | 100 |
| Issue: | 22 |
| Number of pages: | 6 |
| Funding institution: | BMBFFederal Ministry of Education & Research (BMBF) [05K16IPA]; DFGGerman Research Foundation (DFG) [BA 2281/11-1]; Alexander von Humboldt foundationAlexander von Humboldt Foundation |
| 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 |
| Open Access / Green Open-Access |
