Atomistic LLGS simulations of all in-plane grain rotations show configuration II switches Mn3Sn to a single +z octupole state, while configuration I sub-configurations switch in opposite directions and cancel.
Terahertz Magnon Excitations and Switching in Non-Collinear Antiferromagnets
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abstract
We investigate how spatiotemporal spin polarized current can lead to terahertz frequency excitations in non-collinear antiferromagnets. By solving the Landau-Lifshitz-Gilbert equation numerically for non-collinear antiferromagnet, we show that the magnon frequency spectrum exhibits standing spin wave modes and depends on the thickness of Mn$_3$Ge in heterostructure Fe|Au|Mn$_3$Ge. Also, we analyze the switching process of ground state as a function of a spin current. We show a switching phase diagram, which contains switching and non-switching regions. Our work suggests non-collinear antiferromagnets as an efficient platform for terahertz magnonics and ultrafast memory devices.
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Investigation of Sub-configurations Reveals Stable Spin-Orbit Torque Switching Polarity in Polycrystalline Mn3Sn
Atomistic LLGS simulations of all in-plane grain rotations show configuration II switches Mn3Sn to a single +z octupole state, while configuration I sub-configurations switch in opposite directions and cancel.