Exchange-driven all-optical magnetic switching in compensated 3d ferrimagnets
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2020Access:
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Davies C.S., Bonfiglio G., Rode K., Besbas J., Banerjee C., Stamenov P., Coey J.M.D., Kimel A.V., Kirilyuk A., Exchange-driven all-optical magnetic switching in compensated 3d ferrimagnets, Physical Review Research, 2020, 2, 3Download Item:
Abstract:
Understanding how a single laser pulse can toggle magnetization in a compensated 3d ferrimagnet is a critical
problem in ultrafast magnetism. To resolve it, we test single-shot all-optical switching of magnetization in
Mn 2 Rux Ga at different temperatures using femto- to picosecond pulses in the visible to far-infrared spectral
ranges. The switching process is found to be independent of photon energy, but strongly dependent on both the
pulse duration and sample temperature. Switching is disabled whenever the starting temperature T0 is above the
compensation point of Mn 2 Rux Ga, but as T0 is lowered below compensation, increasingly longer pulses become
capable of toggling the magnetization. We explain the observations in terms of a switching process driven by
exchange relaxation of the angular momenta of the manganese sublattices, and propose a common framework to
account for the similarities and differences of all-optical switching in Mn 2 Rux Ga and GdFeCo alloys.
Author's Homepage:
http://people.tcd.ie/stamenphttp://people.tcd.ie/rodek
http://people.tcd.ie/jcoey
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Physical Review Research;2;
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http://dx.doi.org/10.1103/PhysRevResearch.2.032044ISSN:
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