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The absence of stray fields, their insensitivity to external magnetic fields,and ultrafast dynamics make antiferromagnets promising candidates for activeelements in spintronic devices. Here, we demonstrate manipulation of theN\'{e}el vector in the metallic collinear antiferromagnet Mn$_2$Au by combiningstrain and femtosecond laser excitation. Applying tensile strain along eitherof the two in-plane easy axes and locally exciting the sample by a train offemtosecond pulses, we align the N\'{e}el vector along the direction controlledby the applied strain. The dependence on the laser fluence and strain suggeststhe alignment is a result of optically-triggered depinning of 90$^{\mathrm{o}}$domain walls and their sliding in the direction of the free energy gradient,governed by the magneto-elastic coupling. The resulting, switchable, state isstable at room temperature and insensitive to magnetic fields. Such an approachmay provide ways to realize robust high-density memory device with switchingtimescales in the picosecond range.

Optically-triggered strain-driven N\'{e}el vector manipulation in a metallic antiferromagnet