Regensburg 2022 – scientific programme

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MA: Fachverband Magnetismus

MA 35: Poster 2

MA 35.30: Poster

Thursday, September 8, 2022, 16:00–18:00, P4

Ultrafast demagnetization of 2d ferromagnets — •Nele Stetzuhn^1,2, Felix Steinbach¹, Martin Borchert¹, Abhijeet Kumar², Denis Jagodkin², Clemens von Korff Schmising¹, Stefan Eisebitt¹, and Kirill Bolotin² — ¹Max-Born-Institut, Max-Born-Straße 2 A, 12489 Berlin — ²Fachbereich Physik der Freien Universität Berlin, Arnimallee 14, 14195 Berlin

Two-dimensional ferromagnets are one of the latest additions to the family of 2d materials and offer a new platform to study ultrafast magnetic phenomena. When combining 2d ferromagnets with other 2d materials such as transition metal dicalchogenides (TMDs), the absence of lattice mismatch between layers also makes the resulting heterostructures promising for high-performance spintronic devices. Here, we measure the ultrafast demagnetization of 2d ferromagnets with the structure Fe_xGeTe₂ (x = 3, 5) after excitation by a pump laser using time-resolved MOKE. The usually low Curie temperature of Fe_xGeTe₂ (x = 3, 5) can be increased above room temperature, e.g. by doping with Ni, allowing us to do element-resolved demagnetization measurements at the free-electron laser facility FERMI. This can give insight into effects such as optical inter-site spin transfer (OISTR) in the material.