Ranjan Singh
Energy-efficient spintronic technology holds tremendous potential for the design of next-generation processors to operate at terahertz frequencies. Femtosecond photoexcitation of spintronic materials generates sub-picosecond spin currents and emission of terahertz radiation with broad bandwidth (0.1–30 THz). THz devices are prominent candidates for next-generation wireless communication and ultrahigh data processors, providing a virtual platform for scientific innovations. Nonetheless, the devices continue to face significant hurdles due to the lack of the right choice of materials that could operate beyond existing electronic frequencies. Here, I will discuss our recent results on ferromagnetic/ heavy metal heterostructures for ultrafast THz spin current control with electrical, optical, and magnetic stimuli, including multiferroic and synthetic ferromagnetic materials to control the amplitude, phase, and chiral emission of broadband THz radiation by manipulating the spin textures. Overall, I will discuss the multi-stimuli control of terahertz spintronic emitters.