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Terahertz Magnon Excitation and Neel-Vector Switching in Non-Collinear Antiferromagnets

Ultrafast spin-polarized currents injected into a non-collinear antiferromagnet exert spin-transfer torque that excites standing spin-wave magnon modes at terahertz frequencies and can reverse the antiferromagnetic Neel-order ground state within picoseconds. The magnon spectrum depends on the magnetic layer thickness, and a switching phase diagram distinguishes the current regimes that do and do not flip the order, positioning such materials as a basis for terahertz magnonics and ultrafast memory.