Dresden 2026 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 38: Ultrafast Magnetization Effects II
MA 38.4: Vortrag
Mittwoch, 11. März 2026, 15:45–16:00, POT/0361
Double-pulse all-optical magnetization re-switching of GdFe — Rahil Hosseinifar1, Felix Steinbach2, Ivar Kumberg1, José Miguel Lendínez3, Sangeeta Thakur1, Sebastien E. Hadjadj1, Jendrik Gördes1, Chowdhury S. Awsaf1, Mario Fix4, Manfred Albrecht4, Florian Kronast5, Unai Atxitia3, Clemens von Korff Schmising2, and •Wolfgang Kuch1 — 1Freie Universität Berlin, Berlin, Germany — 2Max-Born-Institut, Berlin, Germany — 3ICMM-CSIC, Madrid, Spain — 4Universität Augsburg, Augsburg, Germany — 5Helmholtz-Zentrum Berlin, Berlin, Germany
The reversible helicity-independent switching of the magnetization direction of ferrimagnetic materials like GdFe by individual sub-ps optical laser pulses bears the potential to accelerate magnetic data storage. We present a systematic Kerr-microscopy domain-imaging study of a 10 nm Gd26Fe74 film after excitation with two laser pulses with a certain time delay in between. Our results show that when the fluence of the first pulse is adjusted just above the threshold of single-pulse switching, a second pulse with about 60% of the fluence of the first pulse, arriving only 4 ps later, can already switch the magnetization back [1]. Atomistic spin dynamics simulations reproduce the experimental results and show that under these conditions the magnetizations of the Fe and Gd sublattices have already moved sufficiently away from zero when the second pulse hits the sample, a prerequisite for fast re-switching.
[1] R. Hosseinifar et al., Phys. Rev. B 112, 174406 (2025).
Keywords: All-optical magnetization switching; GdFe; Kerr microscopy; Spin dynamics