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Energy-efficient control of magnetization without the help of a magneticfield is a key goal of spintronics. Purely heat-induced single-pulseall-optical toggle switching has been demonstrated, but so far only in Gd basedamorphous ferrimagnet films. In this work, we demonstrate toggle switching inthe half-metallic compensated ferrimagnetic Heusler alloys Mn2RuxGa, which havetwo crystallographically-inequivalent Mn sublattices. Moreover, we observe theswitching at room temperature in samples that are immune to external magneticfields in excess of 1 T, provided they exhibit compensation above roomtemperature. Observations of the effect in compensated ferrimagnets without Gdchallenges our understanding of all-optical switching. The dynamic behaviorindicates that Mn2RuxGa switches in 2 ps or less. Our findings widen the basisfor fast optical switching of magnetization and break new ground for engineeredmaterials that can be used for nonvolatile ultrafast switches using ultrashortpulses of light.

Single pulse all-optical toggle switching of magnetization without Gd: The example of Mn2RuxGa