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MA: Fachverband Magnetismus

MA 42: Posters Magnetism I

MA 42.23: Poster

Mittwoch, 18. März 2020, 15:00–18:00, P3

Investigation of ultrafast laser-induced toggle-switching and domain-wall motion in GdFe — •Rahil Hosseinifar¹, Ivar Kumberg¹, Evangelos Golias¹, Sangeeta Thakur¹, Florian Kronast², Manfred Albrecht³, and Wolfgang Kuch¹ — ¹Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany — ²Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Straße 15, 12489 Berlin, Germany — ³Institut für Physik, Universität Augsburg, Universitätsstraße 1, 86159 Augsburg, Germany

Using purely optical means to manipulate the magnetization direction is an interesting way to introduce new potential applications in spintronic devices. Excitation of certain materials by femtosecond laser pulses causes magnetization reversal, irrespective of the magnetization direction. Subsequent pulses thus reverse the magnetization back and forth, which is called “toggle switching”. We study 15 nm thin films of ferrimagnetic GdFe alloys with in-plane and out-of-plane easy axes by X-ray magnetic circular dichroism photoelectron emission microscopy (XMCD-PEEM) using the laser at the SPEEM facility at UE49-PGM1 of BESSY II in Berlin. XMCD-PEEM images after individual linearly polarized laser pulses show clear laser-induced magnetization changes. We observe deterministic and local nondeterministic toggle switching for out-of-plane Gd₂₆Fe₇₄ films over a considerable range of laser fluences. The in-plane-magnetized Gd₂₁Fe₇₉ sample shows lateral displacements of domain walls of up to several µm after laser excitation.