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arXiv · 2105.13862

Influence of magnetic fields on ultrafast laser-induced switching dynamics in Co/Gd bilayers

M. J. G. Peeters·Y. M. van Ballegooie·B. Koopmans
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Abstract

Recently it has been shown that not only GdFeCo alloys exhibit single-pulse helicity-independent all-optical switching (HI-AOS), but that this effect is also seen in Co/Gd bilayers. However, there have been no reports on the explicit time dynamics of the switching process in these bilayers as of yet. Furthermore, time-resolved measurements of switching of other materials are typically done with a constant applied field to reset the magnetization between consecutive pulses and thus ensure repeatable behavior. In this paper we experimentally resolve the explicit dynamics of the switching process in Co/Gd, and the influence of applied magnetic fields on the switching process. We observe that after a switch within several picoseconds, the magnetization switches back at a timescale of hundreds of picoseconds. This backswitch includes a strong dependence on the magnetic field strength even at sub-tesla fields, significantly smaller than the exchange fields that govern the switching dynamics. This surprising behaviour is explained by a combination of longitudinal switching (on a picosecond timescale), precessional switching (on a nanosecond timescale) and domain-wall motion (on a timescale of 10 ns and beyond). We discuss these different switching regimes and their relative importance using simple model calculations.

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M. J. G. Peeters, Y. M. van Ballegooie, B. Koopmans. 2021-05-28. Influence of magnetic fields on ultrafast laser-induced switching dynamics in Co/Gd bilayers. https://doi.org/10.1103/physrevb.105.014429

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