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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