Ultrafast Demagnetization Measurements Using Extreme Ultraviolet Light: Comparison of Electronic and Magnetic Contributions

Medientyp: E-Artikel

Titel: Ultrafast Demagnetization Measurements Using Extreme Ultraviolet Light: Comparison of Electronic and Magnetic Contributions

Beteiligte: La-O-Vorakiat, Chan [VerfasserIn]; Turgut, Emrah [VerfasserIn]; Silva, T. J. [VerfasserIn]; Teale, Carson A. [VerfasserIn]; Kapteyn, Henry C. [VerfasserIn]; Murnane, Margaret M. [VerfasserIn]; Mathias, Stefan [VerfasserIn]; Aeschlimann, Martin [VerfasserIn]; Schneider, Claus M. [VerfasserIn]; Shaw, Justin M. [VerfasserIn]; Nembach, Hans T. [VerfasserIn]

Erschienen: APS, 2012

Sprache: Englisch

DOI: https://doi.org/10.1103/PhysRevX.2.011005

ISSN: 2160-3308

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Beschreibung: 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 M2,3 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 M2,3 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.

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