SKM 2021 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 15: Posters Magnetism IV
MA 15.4: Poster
Donnerstag, 30. September 2021, 13:30–16:30, P
Investigation of ultrafast laser-induced toggle-switching and domain wall motion in GdF — •Rahil Hosseinifar1, Ivar Kumberg1, Evangelos Golias1, Sangeeta Thakur1, Karl Frischmuth1, 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, Building R, Level 4, 86159 Augsburg, Germany
Using purely optical means to manipulate the magnetization direction is an exciting way to introduce new potential applications in spintronic devices. We study 15 nm thin films of ferrimagnetic Gd26Fe74 with out-of-plane easy axis of magnetization by x-ray magnetic circular dichroism photoelectron emission microscopy. Individual linearly polarized laser pulses of 800 nm wavelength above a specific threshold fluence reverse the sample magnetization, independent of the magnetization direction, the so-called toggle switching. Local deviations from this deterministic behavior close to magnetic domain walls are studied. Reasons for nondeterministic toggle switching are related to extrinsic effects caused by pulse-to-pulse variations of the exciting laser system and intrinsic effects related to the magnetic domain structure of the sample. We point out intrinsic effects such as laser-induced domain-wall motion in the toggle switching and magnetic domain-wall elasticity, which cause local deviations from purely deterministic toggle switching.