Ultrafast Demagnetization Measurements Using Extreme Ultraviolet Light: Comparison of Electronic and Magnetic Contributions
| Autor: | Justin M. Shaw, Claus M. Schneider, Emrah Turgut, Stefan Mathias, Chan La-o-vorakiat, Martin Aeschlimann, Margaret M. Murnane, Carson Teale, Thomas J. Silva, Hans T. Nembach, Henry C. Kapteyn |
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| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Physical review / X 2(1), 011005 (2012). doi:10.1103/PhysRevX.2.011005 Physical Review X, Vol 2, Iss 1, p 011005 (2012) |
| ISSN: | 2160-3308 |
| DOI: | 10.1103/physrevx.2.011005 |
| Popis: | Ultrashort pulses of extreme ultraviolet light from high-harmonic generation are a new tool for probing coupled charge, spin, and phonon dynamics with element specificity, attosecond pump-probe synchronization, and time resolution of a few femtoseconds in a tabletop apparatus. In this paper, we address an important question in magneto-optics that has implications for understanding magnetism on the fastest time scales: Is the signal from the transverse magneto-optical Kerr effect at the M_{2,3} edges of a magnetic material purely magnetic or is it perturbed by nonmagnetic artifacts? Our measurements demonstrate conclusively that transverse magneto-optical Kerr measurements at the M_{2,3} edges sensitively probe the magnetic state, with almost negligible contributions from the transient variation of the refractive index by the nonequilibrium hot-electron distribution. In addition, we compare pump-probe demagnetization dynamics measured by both high harmonics and conventional visible-wavelength magneto-optics and find that the measured demagnetization times are in agreement. |
| Databáze: | OpenAIRE |
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