Demonstrates magnetic switching of chiral phonons in ferrimagnets, suggesting new magneto-phononic applications.
Chiral magneto‐phononic modes—hybridized vibrational states that carry angular momentum through coupling with magnetic degrees of freedom—offer a novel route for controlling magnetism and enabling topological phononics. Here, we report the magnetic switching of these hybridized chiral phonons, Zn x Fe 2‐ x Mo 3 O 8 , using helicity‐resolved magneto‐Raman spectroscopy. By tuning the Zn concentration across antiferromagnetic and ferrimagnetic regimes, we uncover two key phenomena: (i) a giant, spontaneous zero‐field splitting (∼10 cm −1 ) of the doubly degenerate E 2 hybridized phonon modes in the ferrimagnetic state, and (ii) a field‐induced Zeeman effect in the antiferromagnetic and paramagnetic phases. The phonon splitting in the ferrimagnetic phase exhibits a pronounced asymmetry with respect to the applied field direction and shows a strong correlation with magnetization, highlighting a selective phonon‐magnon coupling and the emergence of large effective magnetic moments driven by magnetization. Our results demonstrate that chiral hybridized phonons can be dynamically controlled through their intrinsic entanglement with magnon and spin degrees of freedom, enabling the tuning of effective magnetic moments via magnetization and external magnetic fields. These findings establish Zn x Fe 2‐ x Mo 3 O 8 as a compelling platform for exploring novel magneto‐phononic phenomena.
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Choi et al. (2026) studied this question.
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