External magnetic fields suppress ultrafast spin noise amplitude in Sm0.7Er0.3FeO3 by increasing the quasi-ferromagnetic magnon frequency, with noise strength tied to free-energy softening.
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Field-tuning of ultrafast magnetization fluctuations in Sm$_{0.7}$Er$_{0.3}$FeO$_{3}$
External magnetic fields suppress ultrafast spin noise amplitude in Sm0.7Er0.3FeO3 by increasing the quasi-ferromagnetic magnon frequency, with noise strength tied to free-energy softening.