Excitation and detection of terahertz coherent spin waves in antiferromagnetic α−Fe2O3
| Autor: | A. M. Balbashov, A. K. Zvezdin, Alexey Kimel, K. A. Grishunin, E. A. Mashkovich |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Physical Review B. 104 |
| ISSN: | 2469-9969 2469-9950 |
| Popis: | The efficiency of the ultrafast excitation of spins in antiferromagnetic $\ensuremath{\alpha}\text{\ensuremath{-}}{\mathrm{Fe}}_{2}{\mathrm{O}}_{3}$ using a nearly single-cycle THz pulse is studied as a function of the polarization of the THz pulse and the sample temperature. Above the Morin point the most efficient excitation is achieved when the magnetic field of the THz pulse is perpendicular to the antiferromagnetically coupled spins. Using the experimental results and equations of motion for spins, we show that the mechanism of the spin excitation above and below the Morin point relies on a magnetic-dipole interaction of the THz magnetic field with spins, and the mechanism implies that the efficiency of the coupling is proportional to the time derivative of the magnetic field. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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