Regensburg 2016 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 11: Magnetic Thin Films I
MA 11.10: Vortrag
Montag, 7. März 2016, 17:30–17:45, H33
Towards optically controlled magnetization reversal in ferromagnetic (Co/Pt)n and (Co/Pd)n multilayers — •Umut Parlak1, Daniel Bürgler1, Roman Adam1, Gholamreza Shayeganrad2, Shaukat Khan2, and Claus M. Schneider1 — 1Peter Grünberg Institute, PGI-6, Research Centre Jülich, 52425 Jülich, Germany — 2Center for Synchrotron Radiation (DELTA), TU Dortmund, 44227 Dortmund, Germany
Recent studies demonstrate that optical control of the magnetization state by femtosecond laser pulses is feasible in ferromagnetic layers [1] as well as ferrimagnetic rare earth compounds [2]. Moreover, this all-optical manipulation is reversible and reproducible. Nevertheless the optically induced magnetization reversal strongly depends on both material properties and laser beam parameters; e.g. polarization state, fluence and exposure time. Here we investigate the range of material and laser parameters that play a role for the switching process in ferromagnetic (Co/Pt)n and (Co/Pd)n multilayers. We use a laser oscillator and a laser amplifier both having a central wavelength of 800 nm, pulse duration of about 40 fs, and a repetition rate of 80 MHz and 1 kHz, respectively. Kerr and Faraday microscopies are employed to image the domain state before and after the laser exposure. Depending on the laser parameters, a laser-exposed area undergoes magnetization switching, demagnetization or other magnetic modifications.
[1] C. H. Lambert, et al. Science 345,6202 (2014)
[2] C. D. Stanciu, et al. Physical Review Letters 99,4 (2007)