They demonstrate the combined generation of broadband and narrowband magnons in thin films of NiO/Pt. They present two excitation processes which both lead to the emmision of THz signals. These results open new routes towards the development of fast opto-spintronic devices based on antiferromagnetic materials.
They propose a concept of noncollinear spin current, whose spin polarization varies in space even in nonmagnetic crystals. Moreover, by referring to atomistic spin dynamics simulations they show that noncollinear spin currents can be used to switch the chiral spin texture of Mn3X in a deterministic way even in the absence of an external magnetic field. Their theoretical prediction can be readily tested in experiments, which will open a novel route toward electric control of complex spin structures in noncollinear antiferromagnets.
You can find the publication under Phys. Rev. Lett. 129, 097204.