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 B = 0, we find a single antiferromagnetic resonance line at 7 meV and associate it with a doubly degenerate (k = 0) magnon mode. Its energy softens considerably with increasing T, 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.
Room-temperature antiferromagnetic resonance in NaMnAs / Dzian, J., Tázlarů, S., Mohelský, I., Le Mardelé, F., Chudoba, F., Volný, J., Wyzula, J., Pawbake, A., Ritarossi, S., Mazzarello, R., Ritzinger, P., Železný, J., Výborný, K., Uhlířová, K., Grémaud, B., Saúl, A., Faugeras, C., Veis, M., Orlita, M.. - In: PHYSICAL REVIEW. B. - ISSN 2469-9950. - 114:3(2026), pp. 1-9. [10.1103/q9xw-gc4m]
Room-temperature antiferromagnetic resonance in NaMnAs
Ritarossi, Simone;Mazzarello, Riccardo;
2026
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 B = 0, we find a single antiferromagnetic resonance line at 7 meV and associate it with a doubly degenerate (k = 0) magnon mode. Its energy softens considerably with increasing T, 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.| File | Dimensione | Formato | |
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