Large ultrafast photoinduced magnetic anisotropy in a cobalt-substituted yttrium iron garnet
| Autor: | Andrzej Maziewski, Theo Rasing, Alexey Kimel, F. Atoneche, Alexandra M. Kalashnikova, Andrzej Stupakiewicz, Andrei Kirilyuk |
|---|---|
| Rok vydání: | 2010 |
| Předmět: |
Larmor precession
Materials science Condensed matter physics Linear polarization Yttrium iron garnet 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials Magnetization Magnetic anisotropy chemistry.chemical_compound chemistry Ferrimagnetism Spectroscopy of Solids and Interfaces 0103 physical sciences Precession 010306 general physics 0210 nano-technology Anisotropy GeneralLiterature_REFERENCE(e.g. dictionaries encyclopedias glossaries) |
| Zdroj: | Physical Review. B, Condensed Matter and Materials Physics, 81, 214440 Physical Review. B, Condensed Matter and Materials Physics, 81, 21, pp. 214440 |
| ISSN: | 1098-0121 |
| Popis: | We demonstrate experimentally that excitation of a Co-substituted ferrimagnetic yttrium iron garnet thin film with linearly polarized 100 fs laser pulses triggers large-angle magnetization precession with an amplitude, phase, and frequency determined by the characteristics of the laser pulse. The precession results from a light-induced anisotropy field with a characteristic lifetime of 20 ps, the direction of which is determined by the polarization of the light. Its strength for a pump intensity of $25\text{ }\text{mJ}/{\text{cm}}^{2}$ is 250 G which is comparable to the intrinsic anisotropy of the sample. By choosing the proper laser-pulse parameters, we were able to excite a precession with an amplitude as large as $20\ifmmode^\circ\else\textdegree\fi{}$ and a precession frequency modified by up to 50%. |
| Databáze: | OpenAIRE |
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