Room-temperature antiferromagnetic resonance in NaMnAs
Phys. Rev. B 114, 034420 – Published 20 July, 2026
DOI: https://doi.org/10.1103/q9xw-gc4m
Abstract
We report on antiferromagnetic resonance experiments in bulk tetragonal NaMnAs—a room-temperature antiferromagnetic semiconductor. Our results corroborate previous ab initio studies which propose that NaMnAs is an easy-axis antiferromagnet with the Néel vector oriented along the tetragonal axis. At , we find a single antiferromagnetic resonance line at 7 meV and associate it with a doubly degenerate () magnon mode. Its energy softens considerably with increasing , but remains clearly visible in the data up to room temperature. From the experimental data, we estimate the single-ion anisotropy of the Mn ions in NaMnAs in the range 0.1–0.2 meV, a value that is relatively large compared to other manganese-based antiferromagnets.
Physics Subject Headings (PhySH)
- Antiferromagnetism
- Magnetic anisotropy
- Magnetism
- Magnons
- Spin waves
- Antiferromagnets
- Layered crystals
- Layered semiconductors
- Magnetic semiconductors
- Density functional theory
- Fourier transform infrared spectroscopy
- Linear spin wave theory
- Mean field theory
- Optically detected magnetic resonance
- Renormalization group
