Micromagnetic study of subterahertz oscillations in easy-plane antiferromagnets driven by spin Hall effect
Phys. Rev. B 112, 094429 – Published 16 September, 2025
DOI: https://doi.org/10.1103/hq5g-21s9
Abstract
The development of a terahertz signal source operating at room temperature and having the ability to widely tune the frequency is an important scientific task. In this work, we theoretically justify the need for an experiment to observe an antiferromagnetic spin Hall oscillator (AFM SHO) with different easy plane orientations as an essential and integral step towards the creation of such terahertz signal sources. Here, we analyze both analytically and numerically the mathematical model for the canted AFM SHO with different positions of the easy plane and also verify the obtained results using micromagnetic simulations. We obtain analytical expressions for critical currents of the onset of self-oscillations and the end of damping oscillations and show that they both increase as the AFM easy plane approaches either of the two planes containing the spin current polarization vector.
