Journal Article Nanotubes, Carbon Research Support, Non-U.S. Gov't THz spin currents antiferromagnet ballistic decoherence length efficient orbital terahertz emitter electric fields electronic transport effects exchange bias ferrimagnetics heterostructures inverse Edelstein effect low-power-consuming devices magnetic materials magneto-optical effects multi-state switching orbital‐to‐charge conversion room-temperature 2D ferromagnetism single‐shot all‐optical switching skyrmion clusters spintronics topological insulators ultrafast magnetization dynamics and switching ultrafast spectroscopy