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Simulations of magnetization reversal in FM/AFM bilayers with THz frequency pulses

Hirst, Joel; Ruta, Sergiu; Jackson, Jerome; Ostler, Thomas


Joel Hirst

Sergiu Ruta

Jerome Jackson


It is widely known that antiferromagnets (AFMs) display a high frequency response in the terahertz (THz) range, which opens up the possibility for ultrafast control of their magnetization for next generation data storage and processing applications. However, because the magnetization of the different sublattices cancel, their state is notoriously difficult to read. One way to overcome this is to couple AFMs to ferromagnets—whose state is trivially read via magneto-resistance sensors. Here we present conditions, using theoretical modelling, that it is possible to switch the magnetization of an AFM/FM bilayer using THz frequency pulses with moderate field amplitude and short durations, achievable in experiments. Consistent switching is observed in the phase diagrams for an order of magnitude increase in the interface coupling and a tripling in the thickness of the FM layer. We demonstrate a range of reversal paths that arise due to the combination of precession in the materials and the THz-induced fields. Our analysis demonstrates that the AFM drives the switching and results in a much higher frequency dynamics in the FM due to the exchange coupling at the interface. The switching is shown to be robust over a broad range of temperatures relevant for device applications.


Hirst, J., Ruta, S., Jackson, J., & Ostler, T. (2023). Simulations of magnetization reversal in FM/AFM bilayers with THz frequency pulses. Scientific reports, 13(1), Article 12270.

Journal Article Type Article
Acceptance Date Jul 20, 2023
Online Publication Date Jul 28, 2023
Publication Date Jul 28, 2023
Deposit Date Sep 15, 2023
Publicly Available Date Sep 15, 2023
Journal Scientific Reports
Print ISSN 2045-2322
Electronic ISSN 2045-2322
Publisher Nature Publishing Group
Peer Reviewed Peer Reviewed
Volume 13
Issue 1
Article Number 12270
Keywords Terahertz; Ultrafast; Spin Dynamics; Antiferromagets; Modelling; Simulation
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Copyright Statement
© The Author(s) 2023<br /> Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit

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