What is it about?

It used to be a trade-off issue to operate magnets with high speed and low energy consumption. We challenge this conclusion by revisiting theoretically the ultrafast dynamics in antiferromagnets in the presence of a magnetic field. Contrary to previous beliefs, common antiferromagnetic materials such as NiO can be used for spin pumping, spin-torque oscillators, and related ultrafast applications with an accessible current threshold and moderate energy consumption.

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Why is it important?

Data processing and storage could be much faster yet without incurring soaring waste heat compared to state-of-the-art technology, thanks to a series of recent developments in spintronics based on antiferromagnetic materials. This article reports a counterintuitive theoretical prediction that antiferromagnets, even when functioning at sub-terahertz frequencies (two orders of magnitude faster than our computers today), are easy to control by pure electrical means - with accessible current threshold, moderate energy cost, etc.


This article features a quantitative benchmark on a crucial issue in the emerging frontier of antiferromagnetic spintronics and provides direct guidance to ongoing and future experiments in ultrafast electronics.

Dr. Ran Cheng
University of California Riverside Foundation

Read the Original

This page is a summary of: Field-assisted sub-terahertz spin pumping and auto-oscillation in NiO, Applied Physics Letters, August 2022, American Institute of Physics,
DOI: 10.1063/5.0097211.
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