Berlin 2015 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 27: Magnetization / Demagnetization Dynamics I
MA 27.2: Vortrag
Mittwoch, 18. März 2015, 09:45–10:00, EB 301
Movement of magnetic domain walls induced by single femtosecond laser pulses — •Oliver Sandig1, Yasser Shokr1, Bin Zhang1, Jan Vogel2, Florian Kronast3, and Wolfgang Kuch1 — 1Institut für Experimentalphysik, Freie Universität Berlin, 14195 Berlin, Germany — 2CNRS, Institut Néel, 38042 Grenoble, France — 3Helmholtz-Zentrum Berlin für Materialien und Energie, 12489 Berlin, Germany
Controlling the movement of magnetic domain walls (DW) on ultra-short timescales is important to realize novel applications such as racetrack memories. Magnetic interactions between domain walls, magnetic anisotropy, and coupling between different layers may influence the DW motion. To explore the possibilities of ultra-short laser pulses as a means for ultrafast manipulation of DW's, we carried out lateral- and element-resolved x-ray magnetic circular dichroism (XMCD) photoelectron emission microscopy (PEEM) experiments at BESSY II. The experiments focused on the influence of laser pulses with a wavelength of 800 nm and a duration of 60 fs on the magnetic domains in single-crystalline Co/Cu/Ni trilayers on Cu(001). We observe that even single laser pulses can induce significant depinning and motion of domain walls. This can be considered as a laser-induced variant of thermal domain wall fluctuation, which in the quasi-static case leads to thermal melting of magnetic domains. The experiment shows that single laser pulses can switch individual magnetic domains, without demagnetizing the whole sample.
Funding by the DFG (Ku 1115/11-1) is gratefully acknowledged.