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MA: Fachverband Magnetismus
MA 14: Magnetization / Demagnetization Dynamics II
MA 14.5: Vortrag
Montag, 20. März 2017, 16:00–16:15, HSZ 401
Element-resolved study on the influence of a magnetic dopant on the exchange interaction in FePt on ultrashort timescales — •Moritz Barkowski1,2, Daniel Steil3, Lisa Walter1, Steffen Eich1, Jurij Urbancic1, Benjamin Stadtmüller1,2, Manfred Albrecht4, Martin Aeschlimann1, and Stefan Mathias3 — 1TU Kaiserslautern, Erwin-Schroedinger Strasse 46,67663 Kaiserslautern — 2Graduate School Materials Science in Mainz, Staudinger Weg 9, 55128 Mainz — 3University of Göttingen, I. Physikalisches Institut, 37077 Göttingen — 4University of Augsburg, Universitätsstraße 1 Nord, 86159 Augsburg
In this study, we investigate the optically induced ultrafast demagnetization
dynamics of a FePt alloy doped with Mn atoms on the characteristic
timescale of the exchange interaction of a few femtoseconds.
We use high harmonic generation with photon energies in the XUV to
gain elemental resolution in a femtosecond magneto-optical Kerr-effect
experiment [1] in transversal geometry. Following up on earlier experiments,
which showed the importance of the exchange interaction in the
demagnetization process in alloys [2,3], we see clear differences in the
dynamical responses of the three elements Fe, Pt, and Mn. Our results
suggest, that the exchange coupling between the magnetic moments of
the FePt alloy and the Mn dopant changes on ultrashort timescales.
References
Chan L.-O., Phys.Rev.Letters 103,011005 (2009)
S. Mathias, PNAS 109, 4792-4797 (2012)
A.J. Schellekens, Phys.Rev. B 87, 020407(R) (2015)