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MA: Fachverband Magnetismus
MA 35: Poster 2
MA 35.25: Poster
Thursday, September 8, 2022, 16:00–18:00, P4
Studying double pulse toggle switching of GdFe — •Rahil Hosseinifar1, Ivar Kumberg1, Sangeeta Thakur1, Evangelos Golias1, Sebastien Hadjadj1, Jendrik Gördes1, Jorge Torres1, Florian Kronast2, Mario Fix3, Manfred Albrecht3, and Wolfgang Kuch1 — 1Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14,14195 Berlin, Germany — 2Helmholtz-Zentrum Berlin, Albert-Einstein-Straße 15, 12489 Berlin, Germany — 3Institut für Physik, Universität Augsburg, Universitätsstraße 1, 86159 Augsburg, Germany
Switching of magnetization without the help of a magnetic field by using an ultra-fast laser pulse is a popular topic for both applied and fundamental research. We study the effect of double-pulse optical excitation on all-optical toggle switching in Gd26Fe74 ferrimagnetic alloys with perpendicular magnetic anisotropy by X-ray magnetic circular dichroism photoelectron emission microscopy. Varying the temporal separation of the two pulses and their intensities reveals a lowering threshold for toggle switching compared to a single pulse, and the formation of three areas in the footprint of the laser pulses for time delays below 1 ps. First, an area is located at lower fluences that does not switch. The second area is at higher fluences where multi-domain nucleation is observed, and the third area is in between and switches deterministically. The experiment is done starting from either a saturated state or in presence of magnetic domains. In both cases, a deterministically switching area is observed which would be desirable for many applications.