Electrical Manipulation of Chiral Antiferromagnets

Chiral antiferromagnets (AFMs) of the Mn₃X family represent ideal candidates for next-generation spintronic devices, offering robustness to stray fields and ultrafast dynamics enabled by strong exchange interactions. The octupole moment—the characteristic order parameter of chiral AFMs—can be electrically readout via anomalous Hall effect or tunneling magnetoresistance. In this talk, I will discuss mechanisms to electrically manipulate the state and thermal relaxation times of the octupole moment in chiral antiferromagnets. By drawing an analogy between charge dynamics in current-biased Josephson junctions and octupole dynamics in spin-current-biased chiral AFM, we propose a scheme to electrically tune octupole relaxation times by several orders of magnitude. Combining spin dynamics simulations with an effective low energy description of octupole dynamics, we derive analytical expressions for octupole relaxation times. Our work offers fundamental insights into the development of spintronic devices that harness octupole order parameters for information encoding.