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Ultrafast modulation of the anomalous Hall conductivity by coherent magnetization precession in Co-Pt thin films

Zhenya Zhang, Yoichi Shiota, Shutaro Karube, Yuichi Watanabe, Teruo Ono, and Hideki Hirori*

  • *Contact author: hirori@scl.kyoto-u.ac.jp
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Phys. Rev. Applied 24, 044079 – Published 24 October, 2025

DOI: https://doi.org/10.1103/4p39-gyrd

Abstract

Ultrafast dynamics of magnetic properties in the high gigahertz (GHz) or even terahertz (THz) frequency range may be exploited in next-generation data storage and processing devices, and therefore suitable methods for detecting ultrafast dynamics of magnetization need to be developed. In this work, we investigate the impact of optically induced ultrafast precession of magnetization on the anomalous Hall conductivity in a ferromagnetic Co−Pt multilayer structure using THz-based pump-probe measurements. From the measured Faraday rotation, the time-dependent anomalous Hall conductivity σxy is extracted, and our data reveals an initial ultrafast quench due to laser-induced demagnetization and a subsequent oscillation with a frequency that increases with the strength of the applied external magnetic field Hext. for Hext= 30 kOe, the oscillation frequency reaches approximately 100 GHz. The magnetic-field dependence of the oscillation frequency is in good agreement with the prediction from the ferromagnetic resonance model, confirming that the observed oscillation is caused by coherent magnetization precession. These findings are considered to be useful for studies that aim to integrate spintronics and THz electronics.

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Phys. Rev. Applied 24, 044079– Published 24 October, 2025
  • Received 2 July 2025
  • Revised 29 August 2025
  • Accepted 29 September 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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