Prediction and tuning of altermagnetic magnon splitting in RFeO3: non-relativistic and relativistic perspectives
Year: 2026
Type: article
Abstract: Altermagnetism induces momentum-dependent splitting not only in electronic bands but also in magnon spectra. However, the unconventional chiral behavior of magnons in altermagnetic systems remains inadequately understood, limiting the development of novel spintronic functionalities. Here, we investigate the intrinsic altermagnetic magnon splitting in fourteen orthoferrites RFeO 3 (R = rare earth) using first-principles calculations and spin Hamiltonian analysis. We demonstrate that the chiral magnon modes originate from non-relativistic, symmetry-breaking exchange interactions, which lead to distinct momentum-dependent splitting and generate a transverse spin current \({L}_{{xz}}\) . In the canted antiferromagnetic ground state of RFeO 3 , the magnon splitting due to relativistic Dzyaloshinskii–Moriya interaction (DMI) and the non-relativistic altermagnetic contribution coexist but interact weakly and largely independently. Furthermore, we propose a general strain-control mechanism, whereby anisotropic strain modifies the inequivalent superexchange paths through displacement of the rare-earth atoms. This mechanism enables tunable chiral magnon band splitting and spin current, thus making it possible to realize controllable dissipationless magnon current. Our results provide fundamental insights into altermagnetic magnonics and offer new strategies for dissipationless spintronic device.
Source: npj Computational Materials
Institutions: Shanghai University, University of L'Aquila
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $3,490
OpenAlex ID: W7161551878