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Field-tuning of ultrafast magnetization fluctuations in Sm0.7Er0.3FeO3

M. A. Weiss1,*, J. Schlegel1, D. Anić1, E. Steiner1, F. S. Herbst1, M. Nakajima2, T. Kurihara1,3, A. Leitenstorfer1, U. Nowak1 et al.

S. T. B. Goennenwein1

  • *Contact author: marvin.weiss@uni-konstanz.de
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Phys. Rev. B 113, 144419 – Published 10 April, 2026

DOI: https://doi.org/10.1103/sd5w-n7fw

Abstract

The properties of spin fluctuations in antiferromagnets are largely unexplored, in particular at ultrafast timescales. Here, we employ femtosecond noise correlation spectroscopy to experimentally study magnetization fluctuations in the canted antiferromagnet Sm0.7Er0.3FeO3 across its spin-reorientation transition and under external magnetic fields. By comparing our measurements to atomistic spin noise and Monte Carlo simulations, we find that the amplitude of the spin noise is governed by the free energy, with stronger fluctuations in regions where the potential landscape softens. We furthermore demonstrate that external magnetic fields suppress spin fluctuations and enhance the quasiferromagnetic magnon frequency by effectively stiffening the potential. These results highlight an effective route for tuning ultrafast magnetization fluctuations via external parameters.

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Phys. Rev. B 113, 144419– Published 10 April, 2026
  • Received 30 September 2025
  • Revised 18 February 2026
  • Accepted 16 March 2026
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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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