I. Terahertz Spintronics with Antiferromagnetic Insulators
The aim of this project is to explore spin transport in antiferromagnetic insulators excited by spin currents associated with spin-orbit interactions in a proximal metal layer such as Pt, W or Ta. The spin-Hall effect in these metals creates a spin current that can excite spin waves in the antiferromagnet.
Left: A schematic of a spin-Hall oscillator based on spin-injection from a heavy metal (HM) into an antiferromagnetic insulator (AF). Right: Frequency of spin precession as a function of the spin current. Adapted from Phys. Rev. Lett. 116, 207603 (2016)
For more information see:
Egecan Cogulu, Hantao Zhang, Nahuel N. Statuto, Yang Cheng, Fengyuan Yang, Ran Cheng, and Andrew D. Kent, “Quantifying Spin-Orbit Torques in Antiferromagnet–Heavy-Metal Heterostructures,” Physical Review Letters 128, 247204 (2022). full text (pdf form)
Egecan Cogulu, Nahuel N. Statuto, Yang Cheng, Fengyuan Yang, Rajesh V. Chopdekar, Hendrik Ohldag, and Andrew D. Kent, “Direct imaging of electrical switching of antiferromagnetic Néel order in α-Fe2O3 epitaxial films,” Physical Review B 103, L100405 (2021). full text (pdf form)
Arun Parthasarathy, Egecan Cogulu, Andrew D. Kent and Shaloo Rakheja, “Precessional spin-torque dynamics in biaxial antiferromagnets,” Physical Review B 103, 024450 (2021). full text (pdf form)
