Magnetic Topological Insulators for Dissipationless Monostructural Adiabatic Spintronic

Adiabatic electric currents offer a promising route toward energy-efficient computation. In contrast to conventional ohmic currents, which produce substantial Joule heating, adiabatic transport can, in theory, achieve lossless electron transport with 100% mechanical efficiency. Through the Néel-type spin-orbit torque (NSOT), the antiferromagnetic (AFM) dynamics in a material can be driven at a very high efficiency by means of an electric field. In this work, we demonstrate an unconvential AFM resonance driven purely by an electric field in a layered AFM insulator bulk crystal. This electric field driven resonance is characterized though a spectroscopic study at a variety of frequencies using a quasi-optical CW EPR system. Rotation of the microwave polarization in the Voigt geometry provides selectivity between magnetic and electric-field driven resonance mechanisms, enabling the isolated study of each. This novel electric field driven resonance is a signature of the exotic NSOT which holds the potential to facilitate data processing and dramatically reduce energy dissipation in such processes.