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.
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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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